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Grilled Cheese Recipe for Two with Caramelized Onion & Apple

This grilled cheese recipe for two combines the sweetness of caramelized onions and apple with the savory depth of cheddar and mustard, tucked between crispy, golden slices of rustic bread. It's a cozy and flavorful vegetarian meal perfect for a quick lunch or light dinner.
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Total Time 45 minutes
Course Sandwich
Cuisine American
Servings 2

Equipment

  • 12-inch nonstick skillet with lid
  • Dutch oven or large pot for pressing

Ingredients
  

Caramelized Onion

  • 2 teaspoons extra-virgin olive oil
  • 1 onion halved and sliced thin
  • 6 tablespoons water divided
  • ¼ teaspoon table salt
  • ⅛ teaspoon pepper
  • 1 teaspoon Dijon mustard
  • ¼ teaspoon minced fresh thyme or a pinch of dried thyme

Sandwiches

  • 4 ½-inch-thick slices rustic bread
  • 2 teaspoons extra-virgin olive oil divided
  • 1 small apple cored and thinly sliced
  • 4 slices cheddar cheese

Variation: Grilled Cheese Sandwiches with Tomato and Pesto

  • Skip the caramelized onion.
  • Use 4 thin tomato slices instead of apple.
  • Substitute mozzarella for cheddar.
  • Spread 1 tablespoon pesto on the non-oiled sides of the bread slices before layering tomato and mozzarella.

Instructions
 

  • Prepare the Caramelized Onion: Heat 2 teaspoons of oil in a 12-inch nonstick skillet over medium heat until shimmering. Add the onion, 4 tablespoons of water, salt, and pepper. Cover the pan and let the mixture cook until the onions soften and the liquid mostly evaporates, about 5 to 7 minutes. Remove the lid, lower the heat to medium-low, and continue cooking, stirring occasionally, until the onions turn golden brown, roughly 13 to 15 minutes.
  • Finish the Onion Mix: Pour in the remaining 2 tablespoons of water and stir to loosen any browned bits. Let the mixture simmer until the liquid disappears, about 1 minute. Remove from heat, stir in Dijon mustard and thyme, then transfer to a small bowl to cool slightly. (You can refrigerate this mixture for up to 3 days.)
  • Assemble the Sandwiches: Lay out the bread slices and brush one side of each slice with ½ teaspoon olive oil. Flip two of the slices so the oiled side is down, and layer on the caramelized onion, apple slices, and cheddar cheese. Place the remaining slices on top, oiled side up.
  • Grill the Sandwiches: Wipe out the skillet and set it back on the stove. Place the sandwiches in the pan and weigh them down with a Dutch oven or heavy pot (do not press down). Cook over medium-low heat until the bottoms are golden and crisp, about 5 to 7 minutes. Flip carefully using two spatulas, then cook the other side until golden and the cheese is melted, another 5 to 7 minutes. Serve immediately.

Notes

  • Choose a sweet apple variety like Fuji or Honeycrisp for the best balance against the sharp cheddar.
  • Rustic bread with wide slices works best for structural integrity and flavor.
  • Wrapping the bottom of your Dutch oven with foil makes cleanup easier.
Keyword apple cheddar grilled cheese, caramelized onion sandwich, grilled cheese for two, recipes for two, romantic dinner recipes, rustic grilled cheese ideas, vegetarian sandwich recipe
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