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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.

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