Sautéed Green Beans With Mushrooms and Caramelized Cipollini Onions Recipe

Name: Sautéed Green Beans With Mushrooms and Caramelized Cipollini Onions Recipe
Ingredients: 4 tablespoons unsalted butter or extra-virgin olive oil, divided; 1 pound cipollini onions, trimmed and peeled; Kosher salt and freshly ground black pepper; 2 pounds green beans, trimmed; 2 tablespoons canola or vegetable oil; 1 pound button mushrooms, washed, trimmed, and cut into quarters; 1 medium shallot, finely chopped; 4 medium cloves garlic, minced (about 4 teaspoons); 1 teaspoon picked fresh thyme leaves; 1 teaspoon soy sauce; 1 teaspoon juice from 1 lemon