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CRUST: Lightly oil a large bowl and set aside. In another large bowl, combine water, yeast, sugar and olive oil. Let stand several minutes until yeast dissolves. Add both flours and the salt and mix either in a standing mixer or by hand. On a lightly floured surface, pour out dough and knead it until smooth, 3-5 minutes sprinkling with additional flour as needed when it becomes sticky. Place in the oiled bowl and turn to coat; cover with a towel and set aside in a warm place to rise until doubled, about 30 minutes. Punch down and divide dough into 4-6 equal parts, roll into balls and place on a baking sheet. Cover with a warm damp towel, return to a warm place and allow dough to rest at least 15 minutes. On a lightly floured surface, roll and stretch each ball into a circle. I like mine almost paper-thin so it gets extra crunchy, but thick crust is nice too. Don't worry so much about the shape either. Any shape will do. Place shaped dough on a baking sheet which has been covered with cornmeal. Lightly oil the grill and heat to MEDIUM HIGH.
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MEANWHILE, PREP THE TOPPINGS: In the meantime, place sliced tomatoes and mushrooms in a roasting pan, toss with 2-3 tsp olive oil and roast at 400 for 20 minutes. Set aside. In a large skillet, heat 1 Tbsp olive oil over MEDIUM LOW heat. When oil is shimmering/hot, add garlic and stir just until it softens but is not browned, about 1 minute. Remove skillet from heat. Add baby spinach to warm oil and toss until the spinach is just wilted. Season with salt and pepper to taste. Transfer to a medium bowl and set aside.
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GRILL: This next part goes very fast. The most important thing is not to let the bottom of your pizza burn. Place dough on grill and cook until slightly puffed and golden brown, 1-2 minutes. Flip and cook until crust is crisp and golden brown, just a few minutes more. Divide roasted mushrooms and tomatoes, and the wilted baby spinach among the pizza crusts. Sprinkle with feta to taste. Cook just until warmed. Remove from grill. Drizzle with a few drops of truffle oil and serve.
