French Onion Lentil Soup

Ingredients

• butter
• extra-virgin olive oil
• large yellow onions , peeled and thinly sliced
• garlic cloves, minced
• lower sodium tamari
• Kosher salt and cracked black pepper to taste
• petite lentils, such as French lentils or black lentils
• quarts low sodium beef broth
• to 8 sprigs fresh thyme
• bay leaf
• sherry vinegar
• to 12 slices French bread
• grated Gruyère cheese