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French Onion Grilled Cheese Sandwich Recipe

5 Stars 4 Stars 3 Stars 2 Stars 1 Star 4.5 from 45 reviews
  • Author: Lina
  • Prep Time: 15 minutes
  • Cook Time: 45 minutes
  • Total Time: 1 hour
  • Yield: 2 servings 1x
  • Category: Main Course
  • Method: Stovetop
  • Cuisine: French-American
  • Diet: Vegetarian

Description

This French Onion Grilled Cheese Sandwich recipe combines sweet, caramelized onions with layers of melted Swiss cheese and fresh thyme, all sandwiched between buttery toasted bread. It’s a gourmet twist on a classic comfort food, perfect for a cozy lunch or dinner.

Ingredients

Scale

For the Onions

  • 2 tablespoons salted butter softened
  • 2 medium yellow onions thinly sliced
  • Water as needed
  • Salt and pepper to taste
  • ½ teaspoon fresh thyme leaves roughly chopped
  • 1 teaspoon Worcestershire sauce
  • 1 teaspoon sugar
  • 1 teaspoon sherry vinegar or red wine vinegar

For the Sandwich

  • 4 thick slices bread
  • 6 slices Swiss cheese
  • Additional salted butter for spreading on the bread

Instructions

  1. Caramelize Onions: Melt 2 tablespoons of butter in a large sauté pan over medium heat, then add the thinly sliced onions. Stir and cover the pan, cooking until the onions soften, about 5 minutes. Add a splash of water and scrape the bottom of the pan to lift any browned bits, then cover and continue cooking. Repeat adding water and covering several times until onions develop a deep brown, caramelized color.
  2. Season Onions: Stir in the fresh thyme, Worcestershire sauce, sugar, and vinegar. Season with salt and pepper to taste. Continue cooking for 2 to 3 more minutes to meld flavors, then transfer the onions to a bowl to cool slightly.
  3. Assemble Sandwiches: Spread a layer of caramelized onions onto each slice of bread. On two slices, place a folded slice of Swiss cheese, then add more onions, followed by another slice of cheese, more onions, and one final slice of cheese. Top with the remaining bread slices and gently press the sandwiches down to compact them.
  4. Cook Sandwiches: Preheat a large sauté pan or griddle over medium-low heat. Butter one side of each sandwich and place butter-side down on the pan. Cook until golden brown, about 4 minutes. Butter the top-facing side while cooking, then carefully flip the sandwiches. Cook until golden on the other side. To melt the cheese, add a splash of water to the pan and invert a large bowl over the sandwiches, trapping steam for 1 to 2 minutes.
  5. Serve: Transfer the sandwiches to a cutting board. Use a serrated knife to slice each sandwich diagonally in half. Serve immediately for the best flavor and texture.

Notes

  • Use thick-cut bread for a sturdier sandwich that holds up to the caramelized onions and cheese.
  • If you prefer, substitute Swiss cheese with Gruyere or a blend of Swiss and mozzarella for more gooey meltiness.
  • Adding a splash of water during onion cooking helps them caramelize without burning.
  • The steaming method with a bowl is key to ensure fully melted cheese without burning the bread.
  • Leftover caramelized onions can be stored in the refrigerator for up to 3 days and used in other recipes.

Find it online: https://linadinner.com/french-onion-grilled-cheese-sandwich-recipe/