"Try this roasted-vegetable free-form tart as an appetizer or side dish for a special dinner or as a vegetarian main dish. The pastry dough is very forgiving and quite easy to roll out on parchment paper or a nonstick baking mat. The walnut-studded crust is crisper served warm, but you can enjoy the tart at room temperature or cold too...."
INGREDIENTS
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3/4 cup walnuts
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1 1/4 cups whole-wheat pastry flour (see Note)
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1 1/4 cups all-purpose flour, plus more for dusting
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2 tablespoons chopped fresh thyme and/or rosemary
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3/4 teaspoon salt
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3/4 teaspoon freshly ground pepper
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1/2 cup extra-virgin olive oil
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7 tablespoons ice-cold water
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1 1/2 pounds sweet potatoes, peeled and sliced into 1/4-inch-thick slices
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1 tablespoon plus 2 teaspoons extra-virgin olive oil, divided
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1/2 teaspoon salt
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1/4 teaspoon freshly ground pepper
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1 1/2 cups thinly sliced red onion
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1 cup shredded fontina or Cheddar cheese
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1 large egg white mixed with 1 teaspoon water
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1 teaspoon chopped fresh thyme and/or rosemary