Caramelized Onion & Gruyère Grilled Cheese (Print Version)

Slow-cooked caramelized onions and nutty Gruyère cheese melted between crispy golden country bread for a gourmet sandwich.

# Ingredient List:

→ 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

# How to Make:

01 - In a large skillet over medium-low heat, melt butter with olive oil. Add sliced onions, salt, and pepper. Cook, stirring occasionally, until deeply golden and caramelized, approximately 25 to 30 minutes. Stir in thyme and balsamic vinegar, then cook 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. 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 the pan and cook until golden brown and cheese is melted, approximately 3 to 4 minutes per side. Press gently with a spatula to ensure even toasting.
05 - Slice each sandwich in half and serve immediately.

# Expert Advice:

01 -
  • Gourmet Flavors: The combination of deeply caramelized onions and nutty Gruyère provides a rich, complex taste.
  • Perfect Texture: Rustic country bread offers the ideal crunch to contrast with the gooey, melted cheese filling.
  • Easy Elegance: With a preparation time of just 20 minutes, it is a simple yet impressive vegetarian meal.
02 -
  • Low and Slow: Don't rush the onions; the full 25-30 minutes of cooking is necessary for the deep caramelization that provides the sandwich's signature sweetness.
  • Soft Butter: Using softened butter for the exterior ensures an even, golden crust without tearing the bread.
  • Fresh Herbs: The optional fresh thyme adds a subtle earthiness that elevates the balsamic and onion flavor profile.
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