Caramelized Onion & Gruyère Grilled Cheese (Printable View)

Sweet caramelized onions paired with creamy Gruyère cheese, melted between slices of crispy golden country bread for a gourmet sandwich.

# Needed Ingredients:

→ Caramelized Onions

01 - 2 large yellow onions, thinly sliced
02 - 2 tablespoons unsalted butter
03 - 1 tablespoon olive oil
04 - 1/2 teaspoon salt
05 - 1/4 teaspoon freshly ground black pepper
06 - 1 teaspoon fresh thyme leaves
07 - 1 teaspoon balsamic vinegar

→ Sandwiches

08 - 4 slices rustic country bread
09 - 4 ounces Gruyère cheese, grated
10 - 1 tablespoon unsalted butter, softened

# Directions:

01 - In a large skillet over medium-low heat, melt 2 tablespoons butter with 1 tablespoon olive oil. Add sliced onions, salt, and pepper. Cook, stirring occasionally, for 25-30 minutes until deeply golden and caramelized. Stir in thyme and balsamic vinegar, then cook for 1 minute longer. Remove from heat.
02 - Lay out bread slices. Evenly distribute caramelized onions on two slices. Top each with half of the grated Gruyère cheese. Place remaining bread slices on top to close sandwiches.
03 - Spread softened butter on the outside of each sandwich.
04 - Heat a non-stick skillet or griddle over medium heat. Place sandwiches in pan and cook for 3-4 minutes per side until golden brown and cheese is fully melted. Press gently with spatula to ensure even toasting.
05 - Slice each sandwich in half and serve immediately.

# Expert Hints:

01 -
  • The sweetness of slow cooked onions balances perfectly with Gruyères sharp nuttiness
  • Worth every minute of onion caramelizing time
  • Transforms a simple lunch into something restaurant worthy
02 -
  • Rushing the caramelization process is the biggest mistake you can make with this recipe
  • Low and slow heat is what creates those deep sweet flavors you are looking for
03 -
  • Pat the cooked onions gently with paper towels if they seem too oily before adding to sandwiches
  • Grate your own cheese instead of buying pre shredded for better melting
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