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Caramelized Onion & Tomato Tart + tomato tips

Thank you so much for visiting today! This post is sponsored by PRO-MIX and contains affiliate links, which means I may receive a small amount of compensation if you chose to purchase from my links. We only write about and link to products we know and love.

Slicing into your first homegrown tomato of the season is like a treat for the senses. The vibrant colors, the smell of fresh dirt mixed with the promise of something delicious and the firmness as your blade makes the first cut are truly some of the mini joys in a gardener’s life.


Summer tomatoes are something every gardener waits for with anticipation – like kids waiting for fireflies and warm, summer nights with no school the next day. They signal the peak of summer, the abundance of memories to be made and are a time for home chefs like myself to discover new dishes – like a Caramelized Onion and Tomato Tart – and having the perfect ingredients to recreate traditional favorites too like homemade pasta sauce and pizza sauce.


Tomatoes were one of the first vegetables I grew when I began gardening about five years ago in our former Illinois home. I was about 7-and-a-half-months pregnant with Roman and standing in one of the garden beds Kevin made me, digging in the dirt in a maternity dress that I had hiked up around my knees. But even as my oddly shaped body teetered to maintain balance on loose soil, I carefully and snuggly placed our first little tomatoes plants into the soil.


Over the years I learned many lessons when it came to growing tomatoes. Tomato horn worms? Bad. Spacing your plants properly? Good. Using other plants and vegetables to deter said horn worms? Also, good.

Caramelized onion & Tomato Tart

Tips for growing tomatoes from seeds

Here’s a few tips I’ve found over the years growing tomatoes from seeds

  • Tomatoes are one of the easiest plants to grow from seed as long as you have good starter soil. We like PRO-MIX Premium Organic Garden Mix because it has natural ingredients and exclusive mycorrhizae technology for healthier plants. Also, starting everything in an organic mix is a must for us here on the farm.
  • If you live in colder climate, like we do in Michigan. You need to start your seeds in doors.
  • Tomatoes seeds need warmth, light and moist soil to grow. You can have all these things just by placing seedling by a window free of drafts. We are in the process of building a greenhouse that we will use in future seasons. However, since it isn’t complete yet, we started out tomato seeds and other vegetables under lights in our basement. You can find the ones we used {HERE} and {HERE}.
  • The seedlings for tomatoes (and all plants really) will grow studier if they are tossed around a bit by the wind. You can simulate this with a fan if you need to start them indoors.

garden bench with Pro Mix

Tips for transplanting and growing tomatoes

  • When you’re ready to put them outdoors, plant on a cool, overcast day and plant them deeper than they were in their indoor pots. You can even pull off the bottom set or two of leaves and plant to there, especially if your plants have gotten very tall.
  • This year we’ve used PRO-MIX Premium Organic Garden Mix to pot our seeds and we’ve also used it to top off some of our old, raised beds to give the soil a boost. We know that it will further help the tomatoes to thrive and develop those additional roots once we transplant them.
  • Tomatoes are sun worshipers. They will give you all the fruit if you give them all the sun.
  • Plant tomatoes with basil, borage and marigolds to try to help prevent tomato horn worms.
  • Basil also helps improve the flavor of tomatoes and is also said to discourage flies and mosquitoes.

Tomato tips


The Caramelized Onion & Tomato Tart

Some of my favorite tomato recipe in the summertime are often the simplest. We mix them with basil, cucumber and mozzarella and eat that almost every night with dinner each season. Or we will layer a similar combination on some delicious sourdough bread and call it dinner.


However, one of our favorite new recipes is a Caramelized Onion & Tomato Tart combines the full, beautiful flavor of roasted tomatoes, roasted onions, basil and herbed ricotta cheese on a homemade puff pastry. That might sound intimidating, but I promise you, homemade puff pastry is so easy to make and it’s perfectly flakey crust will rival any store bought brand.


Puff pastry

Caramelized Onion & Tomato Tart

Caramelized Onion & Tomato Tart

Caramelized Onion & Tomato Tart


No matter which you choose, this Caramelized Onion & Tomato Tart is one recipe that will soon become a summer favorite. Roasting the onion caramelizes it to perfection and it gives the tomatoes a warm, robust flavor.


The Caramelized Onion & Tomato Tart also includes the brightness of fresh basil with layers of tomatoes, cheese and onions. I added some arugula too because I love the peppery taste it adds to any fresh dish.


The first time I made this Caramelized Onion and Tomato Tart, Kevin and I ate all of it for dinner that evening. It was the perfect way to end a very long day of running between work, checking on our newly hatched chickens and various garden projects. It didn’t feel overly heavy and it’s a fantastic meatless option when you just want an easy dinner.

Caramelized Onion & Tomato Tart

Caramelized Onion & Tomato Tart

Caramelized Onion & Tomato Tart


Get the Caramelized Onion & Tomato Tart recipe and find PRO-MIX products

You can find the full, printable recipe for the Caramelized Onion and Tomato Tart below and you can find PRO-MIX Premium Organic Garden Mix at Walmart and Menards.


Click {HERE} to learn more about PRO-MIX Premium Organic Garden Mix and see all the ways it can help all your vegetables and flowers flourish this season.


Thank you so much for visiting today, friends! I hope you will come back later this season to check out all the progress we’ve made in the garden. For more garden posts, click here. For more recipe posts, click here. To find the recipe for the homemade Puff Pastry, click here.

Print Recipe
5 from 12 votes

Caramelized Onion & Tomato Tart

This Caramelized Onion & Tomato Tart is an easy dinner or appetizer for any summer gathering. Yielding 6 large, slices you can also just make it for an easy family dinner.
Prep Time10 mins
Cook Time40 mins
Course: Appetizer, Main Course
Cuisine: American, Italian
Keyword: Caramelized onion and tomato tart, puff pastry, tomato tart
Servings: 6
Author: Rachel Quenzer


  • Cookie sheet
  • Mixing bowl
  • Mini Food processor (optional)


  • 1 Puff pastry. Either homemade or store bought. You can find my recipe here.
  • 8 oz Ricotta Cheese
  • 1/3 cup fresh basil, chopped Plus a little extra for your topping
  • 1/4 tsp. salt
  • 1/4 tsp fresh cracked pepper
  • 5 cloves of whole garlic, peeled
  • 2-3 Heirloom Tomatoes If you can’t find Heirloom, you can use 4-5 Roma tomatoes.
  • 3/4 large onion, sliced
  • 4 Tbsp. of extra virgin olive oil, divided Don’t skimp on the extra virgin olive oil. A good, quality olive oil will always elevate your recipe.
  • Additional salt & pepper to taste
  • Optional: Arugula and balsamic vinegar


  • While the puff pastry cooks, slice your tomatoes and onions and add them to a cookie sheet. Also add your whole cloves of garlic. Brush all sides with 2 Tbsp. of your olive oil and sprinkle on salt and pepper to taste
  • Once the pastry is done, preheat your oven to 425 and roast the tomatoes, onions and garlic for 20 minutes.
  • When done, combine the Ricotta cheese, roasted garlic, 2Tbsp. of olive oil, basil and the ¼ tsp. of salt and ¼ tsp of pepper in a small food processor. Blend together lightly until the garlic and oil are well combined. You can also do this by hand if you're fine with having chunkier bits of garlic.
  • Push down the center of your puff pastry lightly and then spread your Ricotta mix onto the puff pastry. Layer on your tomatoes and onions. If you want to add arugula, add it before layering your tomatoes and onions.
  • Sprinkle with additional salt and pepper and extra chopped basil. If you want to add balsamic drizzle it on right before you serve the tart.


Make sure to use a good quality extra virgin olive oil. It will add so much to all your recipes, not just this one. 
You can substitute 4-5 Roma tomatoes for Heirloom Tomatoes if you can't find them. 
If you want to add arugula, add it before layering the tomatoes and onions on. 


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  1. ashley

    Oh my goodness this tart looks delicious! I love tomatoes & onion, so this is something I would definitely make.

  2. Jenn

    5 stars
    That sounds delicious! I’ve never had a tart like this. I love the caramelized onion. What a flavor. I have to make this.

  3. Jazmin

    I can literally smell this! Lol it sounds so good, my mouth is watering!

  4. Tara Pittman

    I am drooling over here. I love caramelized onions and this sounds delicious

  5. Catherine

    My mouth is watering! This looks delicious. Caramelized onions are my weakness so I can’t wait to try this out.

  6. Lisa

    These look so good! So many of my favorite flavors together! I totally need to try making something like this!

  7. Rog Willis

    5 stars
    I really love your tips on growing tomatoes! I plan on growing a couple of tomato plants when we move into our house. I love this recipe, but, my wife and I are doing keto, so we’d have to make some substitutions.

  8. Amy Desrosiers

    These tart looks so good! We just planted all kinds of delicious tomatoes and I cannot wait until they are done.

  9. Myrah Duque

    5 stars
    What deliciousness! I need to make this tart. It looks so delicious!

  10. Fatima Torres

    5 stars
    I love recipes with caramelized onions — they are one of my favorites. I’ve never tried this combination of flavors. Sounds delicious!

  11. Kita Bryant

    5 stars
    One, that’s a really dang gorgeous tart! Two, wow, those flavor combinations are calling my name! YUM!

  12. Catalina

    5 stars
    Love easy, delicious and genuine dishes and this is one of them. I will definitely try this combo!

    • Catalina

      5 stars
      I’ve made these tarts and my family loves it! They are incredibly delicious! Very easy to make but so fancy taste!

  13. Gervin Khan

    5 stars
    What a delicious and an easy recipe to make, I will definitely try this at home.

  14. Toni

    5 stars
    This tart looks really amazing! Would love to give it a try!

  15. Monica

    I’m starting up a garden this year as well! Also that recipe looks wonderful! I’ll have to try it.

  16. Kayvona

    My mom would love this! Sending her way!

  17. Shayla Marie

    This looks so good. I seriously want to jump into the picture and eat it all up. Saving to make!!

  18. This recipe looks SO good! I am definitely showing this to my husband tonight – he loves to cook for us and I have a feeling these tomatoes would be right up his alley!

  19. Sarah

    This looks absolutely delicious.

  20. Clair

    Yum!! This sounds absolutely amazing!! I can’t wait to make this!

  21. Diana

    These look so yummy! We’re going to try growing tomatoes, so may have to try making these!

  22. This sounds super yummy! I just can’t wait to try it!

  23. Ashley J Newton

    Um, okayyyy. I need this in my belly NOW!

  24. Aliya

    Omgness, this looks absolutely delicious. I can’t wait to try this recipe!

  25. I’m not sure I’ve seen onions look so DELICOUS!

  26. Sherry

    I love fresh from the garden tomatoes but we didn’t plant any this year. This tart looks absolutely delicious.

  27. Jen

    5 stars
    I would love to try this! Looks so good!

  28. Natalie

    5 stars
    Oh wow that looks fantastic. I love the flavors. I guess I could use plain pitta bread as a base for this. I’m not much a fan of puff pastry. I must give this a try asap.

  29. Sim @ Sim's Life

    5 stars
    I love making puff pastry tarts and this looks amazing! Not been brave enough to try making homemade puff pastry just yet though! Sim x

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