3 large yellow onions (2 1/2 pounds total) 2 tablespoon unsalted butter 3 sprigs fresh thyme or 1/4 teaspoon dried thyme, crushed 1 teaspoon salt ¼ teaspoon pepper ½ cup water, broth, or dry white wine
For the Multicooker Beef Broth
1 tablespoon olive oil 1 pound beef chuck roast or meaty beef shanks 1 teaspoon kosher salt 2 pound beef bones, knuckles, and/or marrow bones 1 large onion, unpeeled and coarsely chopped (2 cups) 2 large carrots, coarsely chopped (1 1/2 cups) 2 large celery stalks, coarsley chopped (1 1/3 cups) 1 ounce dried shiitake mushrooms 1 tablespoon tomato paste 3 thyme sprigs (optional) 1 bay leaf 2 tablespoon soy sauce ½ teaspoon freshly ground black pepper, or to taste...