Melt 2 Tbsp butter in heavy large skillet over medium-high heat. Add ¼ of mushrooms and sprinkle with salt. Sauté mushrooms until tender and beginning to brown, 3-4 minutes. Transfer mushrooms to medium bowl. Working in 3 more batches, repeat with 6 Tbsp butter, remaining mushrooms, and salt and pepper.
Bring 7 c broth to simmer in medium saucepan; keep warm. Melt remaining 1½ Tbsp butter with olive oil in heavy large saucepan over medium-low heat. Add leek, sprinkle with salt, and sauté until tender, 4-5 minutes. Add rice and increase heat to medium. Stir until edges of rice begin to look translucent, 3-4 minutes. Add white wine and vermouth and stir until liquid is absorbed, about 1 minute. Add ¾ c warm broth; stir until almost all broth is absorbed, about 1 minute. Continue adding broth by ¾ cupfuls, stirring until almost all broth is absorbed before adding more, until rice is halfway cooked, about 10 minutes. Stir in sautéed mushrooms. Continue adding broth by ¾ cupfuls, stirring until almost all broth is absorbed before adding more, until rice is tender but still firm to bite and risotto is creamy, about 10 minutes. Stir in ¼ c grated Parmesan cheese, if using. Transfer risotto to serving bowl. Pass additional Parmesan cheese alongside, if desired.
Tags: BonAppetit, Bon-Appetit, Bon Appetit, Dinner, Italian, Leek, Main, Mushroom, Rice, Risotto, Side, Vegan, Vegetarian
https://www.bonappetit.com/recipe/wild-mushroom-risotto