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Preparation
Preheat oven to 400°F.
Toss together portobellos, garlic, onion, pepper, celery, carrots, and 1 tablespoon oil on a large, rimmed baking sheet lined with parchment paper. Spread in a single layer.
Roast 25-35 min and broil for last 5 minutes until vegetables are charred in spots, rotating pan and flipping vegetables halfway through.
Place walnuts in food processors and process until finely chopped (or chop by hand). Empty into a bowl; set aside.
Let veggies cool 5 minutes once out of oven. Squeeze roasted garlic out of skins, then discard skins. Transfer garlic and vegetable mixture to a food processor. Pulse until finely chopped; set aside.
Heat 3 tablespoons olive oil in a large, deep skillet over medium-high. Add cremini mushrooms; cook until browned, about 3 minutes. Stir in veggies from food processor, walnuts, chili flakes and oregano; cook, stirring constantly, about 1 minute.
Stir in the tomato paste and cook 1 minute.
Add wine to deglaze and cook, stirring constantly, until slightly thickened, about 1 minute.
Stir in sauce and allow to simmer on a very low heat while you prepare your spaghetti according to package instructions. Then serve with pasta.
Source : Metro