Drunken Onion Grilled Cheese | Command Cooking

Ingredients

• 1 tablespoon olive oil
• 1 large red onion, halved and thinly sliced lengthwise
• 1 tablespoon brown sugar
• 1/4 teaspoon salt
• 1/4 teaspoon pepper
• 1 tablespoon bourbon
• 4 1/2 tablespoons unsalted butter, softened, divided
• 1 1/2 cups sharp cheddar cheese, grated
• 1 1/2 cups Gruyère cheese, grated
• 8 slices crusty bread, such as sourdough or Italian