French Onion Soup - slow cooker

By Joan_Z

Ingredients

• 3 pounds yellow onions, cut in half and thinly sliced
• 2 tablespoons unsalted butter, melted
• 2 tablespoons olive oil
• 2 ½ teaspoons kosher salt
• ½ teaspoon freshly ground black pepper
• 2 sprigs fresh thyme
• ¼ cup balsamic vinegar
• 8 cups (2 32-ounce cartons) beef broth
• 4 to 6 baguette slices, toasted (1 slice per bowl)
• ⅓ to 2 cups grated Gruyere cheese (⅓ cup per bowl)
• Place the onion slices in a 5-quart crockpot, add the butter, olive oil, salt, and black pepper.
• Cook, covered, on low overnight or for 10-12 hours. At the end of the cooking time, the onions will be dark golden brown and soft.
• Add the beef broth, balsamic vinegar, and fresh thyme.

Preparation

Step 1

Place the onion slices in a 5-quart crockpot,
add the butter, olive oil, salt, and black pepper.

Cook, covered, on low overnight or for 10-12 hours. At the end of the cooking time, the onions will be dark golden brown and soft.

Add the beef broth, balsamic vinegar, and fresh thyme.