French Onion Short Rib Soup with Gruyère Toast
Ingredients:
6 tablespoons salted butter
4 medium yellow onions, thinly sliced
Black pepper, to taste
2 shallots, sliced
4 cloves garlic, chopped
2 tablespoons fresh thyme leaves
2 tablespoons chopped fresh sage
Red chili flakes, to taste
6-8 cups low sodium chicken broth
1/2 cup tamari or low-sodium soy sauce