CARAMELIZED ONION GRILLED CHEESE

Caramelized Onion Grilled Cheese image

Provided by Geoffrey Zakarian

Time 35m

Yield 2 servings

Number Of Ingredients 12

3 tablespoons unsalted butter, at room temperature
1 small yellow onion, thinly sliced
1 teaspoon fresh thyme leaves, chopped
Kosher salt and freshly ground black pepper
1 tablespoon plus 1 teaspoon Dijon mustard
1/4 cup shredded sharp Cheddar
1/4 cup shredded Gruyere cheese
1/4 cup diced Robiola cheese
1 tablespoon prosecco
2 teaspoons fresh parsley, chopped
1 clove garlic, minced
Four 1-inch-thick slices brioche

Steps:

Heat 1 tablespoon butter in a medium skillet over medium heat. Add the onions and sprinkle with the thyme, 1/2 teaspoon salt and several grinds of pepper. Cook, stirring occasionally, until the onions are browned and tender, about 20 minutes. Turn off the heat and stir in 1 tablespoon of the Dijon mustard and 1 tablespoon water to coat the onions. Transfer to a bowl and set aside.
Heat a griddle over medium heat.
Buzz the Cheddar, Gruyere, Robiola, prosecco, parsley, garlic and remaining 1 teaspoon Dijon mustard in a food processor until combined but still chunky and spreadable. Evenly spread the cheese mixture over one side of each slice of bread. Top 2 slices with the onion mixture and then sandwich the onions with the other 2 slices, cheese-side in. Spread the remaining butter on the outside of each sandwich and season with salt and pepper. Griddle the sandwiches over medium heat until golden brown on the first side, about 5 minutes. Flip and continue to cook until the cheese is melted and the exteriors are crispy, about 5 minutes more.