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Squash and Caramelized Onion Tart

Squash and Caramelized Onion Tart

Squash and caramelized onion tart

Squash and Caramelized Onion Tart Recipe

Create a stunning vegetarian masterpiece with this Squash and Caramelized Onion Tart, baked on your Arteflame Grill's Pizza Oven attachment. A delightful blend of flavors, it's perfect for any gathering.

Cooked on the Arteflame Grill with Pizza Oven Attachment

Serves: 6–8


For the Crust:

  • 1 cup whole wheat flour
  • 1 tsp. kosher salt
  • 1 cup all-purpose flour, plus more for surface
  • 10 Tbsp. chilled unsalted butter, cut into pieces

For the Filling and Assembly:

  • 4 Tbsp. extra-virgin olive oil, divided
  • 4 medium yellow onions, thinly sliced
  • Kosher salt
  • 3 garlic cloves, thinly sliced
  • 2 Tbsp. Dijon mustard
  • Pinch of cayenne pepper
  • 4 oz. sharp cheddar or Gruyère, coarsely grated
  • ½ small butternut squash, halved lengthwise, seeds removed
  • 1 delicata squash, halved lengthwise, seeds removed
  • 1 small sweet potato
  • 1 small red onion
  • 2 sprigs thyme
  • 2 Tbsp. unsalted butter
  • Flaky sea salt

Special Equipment:

  • 11"- or 12"-diameter fluted tart pan with removable bottom or a 9"-diameter springform pan


  1. Prepare the Crust:

    • Whisk together whole wheat flour, salt, and 1 cup all-purpose flour in a large bowl. Add butter and work into the dry ingredients until the largest pieces are nickel-sized.
    • Drizzle in 6 Tbsp. ice water, mixing with your fingers. Gently squeeze together until a shaggy dough forms. Knead until a few dry spots remain.
    • Pat into a disk, wrap in plastic, and chill for at least 2 hours.
  2. Roll and Prep the Crust:

    • Roll out the dough on a lightly floured surface to ⅛" thick. Transfer to the tart pan, press into corners, and trim excess. Freeze for 15–20 minutes.
  3. Cook the Onions:

    • Heat oil on the Arteflame side plancha. Add yellow onions, season with salt, and cook until caramelized, about 45–50 minutes total. Let cool.
  4. Assemble the Tart:

    • Brush mustard over chilled dough and sprinkle with cayenne. Mix cheese into onion mixture and spread over crust.
    • Thinly slice squashes and sweet potato. Arrange in concentric circles on the tart, drizzle with oil, and season with salt.
  5. Bake the Tart:

    • Place the tart under the Pizza Oven attachment and bake until the vegetables are browned and the crust is golden, about 30-60 minutes.
  6. Finish and Serve:

    • Melt thyme and butter, brush over tart, and sprinkle with sea salt.

Enjoy this elegant Squash and Caramelized Onion Tart as a beautiful vegetarian main meal, perfect for dinner parties and cooked to perfection with your Arteflame Grill's Pizza Oven attachment.

These are some of the products we use in this recipe:


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Testimonial Forbes
Testimonial Forbes 4.7/5 stars The Arteflame will be the food and fun focal point of any backyard and is equally at home on a prepared surface or grass lawn.
Testimonial Barbecue Bible
Testimonial Barbecue Bible 5/5 stars If the mythic gods of fire had an earthly temple, the Arteflame grill could serve as it's baptismal font. Its design, at once primeval and modern, symbolizes mankind's relationship with the awesome power of fire.
Testimonial Martha Stewart
Testimonial Martha Stewart 5/5 stars I love this grill - it's made of half-inch carbon steel and corten "weathering" steel with a cooktop that heats from the center out.
Testimonial Steven Raichlen
Testimonial Steven Raichlen 5/5 stars It looks like a Claus Oldenburg sculpture. It functions like a wood burning grill & plancha. It's great for steak, fragile fish, veggies and everything in between.

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