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

Ingredients:

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

Instructions:

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.