Welcome Green Monsters! We're your online guide to making conscious choices that help people, animals and the planet.
Download food monster: the biggest, baddest, yummiest vegan food app!
Buy the #EatForThePlanet book



Cheesy Caramelized Onion and Shiitake ‘Bacon’ Tart [Vegan]

If you enjoy recipes like this, we highly recommend downloading the Food Monster App, it's available for both Android and iPhone and has free and paid versions. The app is loaded with thousands of allergy-friendly & vegan recipes/cooking tips, has hundreds of search filters and features like bookmarking, meal plans and more! The app shows you how having diet/health/food preferences can be full of delicious abundance rather than restrictions!

Frozen pastry dough is actually vegan. Whoa. While it's awesome to make everything from scratch, the idea of an accessible affordable frozen vegan option is perfect for those nights you’re looking for a more effortless recipe! This recipe is quick, easy, cheesy, has a handful of ingredients, packs tons of flavor, aesthetic appeal, perfect for any season, non-vegan approved, and guaranteed to make you swoon even if you’re not an “onion person!”

Cheesy Caramelized Onion and Shiitake 'Bacon' Tart [Vegan]



Cook Time



For the Tart:

  • 2 tablespoons olive oil
  • 3 onions (any type) cups
  • 1 tablespoon brown sugar
  • 2 tablespoons balsamic vinegar
  • 1/2 teaspoon salt
  • 1/2 teaspoon pepper
  • 8 ounces frozen puff pastry (defrosted a couple hours in the refrigerator, or make your own)
  • 2 cups shredded soft vegan mozzarella
  • 1 cup vegan parmesan
  • 2 tablespoons chopped fresh thyme

For the Shiitake Bacon:

  • 1 8-ounce package of Shiitake mushrooms (sliced)
  • 1 tablespoon tamari
  • 2 teaspoons liquid smoke
  • 2 tablespoons coconut oil
  • 1 tablespoon vegan Worcestershire sauce
  • 1 teaspoon red pepper flakes
  • Cracked black pepper


To Make the Shiitake Bacon:

  1. Slice the mushrooms, coat in all the ingredients and bake in the oven on 250°F for 30 to 40 minutes. Rotate the mushrooms midway for an even cook. Mushrooms should be crispy, not hard (coat in ingredients for however long you can).

To Caramelize the Onions:

  1. Heat oil in a large deep pot or pan on medium-high heat. Add onions and cook for about 10 minutes or until wilted and starting to brown. Add sugar, vinegar, salt, and pepper.
  2. Reduce heat and cook gently, uncovered for 20-25 minutes or until richly caramelized. Add a little water if the onions look like they are starting to dry out. Cool.
  3. Roll pastry into a 10-to-14-inch rectangle (or whatever shape you want). Place pastry on a baking sheet lined with parchment paper. Prick with a fork at a couple inch increments to prevent the pastry from forming big bubbles while baking.
  4. Spread onions over pastry, all the way to the edges of the pastry. Sprinkle cheese on top. Sprinkle with thyme. Refrigerate if not baking immediately.
  5. Bake in a preheated oven at 400°F for 18-20 minutes or until cheese has melted and pastry is crispy.
  6. Cool for 5 minutes. Cut into wedges or squares and serve.





Drool-worthy vegan recipes that are deceptively easy. My name is Gabrielle and I’m the founder and creator of EatDrinkShrink.com. I’m an NYC based holistic nutritionist who holds a BS and MS in Clinical Nutrition, work in vegan recipe development, privately teach yoga, and am a future vegan cookbook author. Looking to expand your plant based culinary abilities, obtain vegan product reviews, or receive nutrition counseling? Come join me at eatdrinkshrink.com



Want to read more posts like this? Sign up for our newsletter below!​

Browse through recent recipes below:

Chocolate Peanut Butter Ice Cream Cupcakes [Vegan, Gluten-Free]

Chocolate Peanut Butter Ice Cream Cupcakes [Vegan]

Raspberry and Dragon Fruit Mousse Cake [Vegan]

Raspberry and Dragon Fruit Mousse Cake

Roasted Cauliflower With Leeks and Tarragon [Vegan, Gluten-Free]

Roasted Cauliflower with Leeks and Tarragon

Beet Tacos With Mung Beans With Blackened Tofu, Radish Slaw, and Crispy Corn [Vegan]

Beet Tacos With Mung Beans and Blackened Tofu Radish Slaw and Crispy Corn b

Disclosure: One Green Planet accepts advertising, sponsorship, affiliate links and other forms of compensation, which may or may not influence the advertising content, topics or articles written on this site. Click here for more information.

0 comments on “Cheesy Caramelized Onion and Shiitake ‘Bacon’ Tart [Vegan]”

Click to add comment

Subscribe to our Newsletter

Follow us on

Do Not Show This Again


Submit to OneGreenPlanet

Terms & Conditions ×