Pin this A decadent twist on classic grilled cheese, this sandwich combines caramelized onions with gooey melted cheese for a deeply savory, next-level comfort food experience.
Ingredients
- For the Caramelized Onions: 2 tablespoons unsalted butter, 2 large yellow onions thinly sliced, 1 teaspoon sugar, 1/2 teaspoon salt, 1/4 teaspoon freshly ground black pepper, 1 teaspoon fresh thyme leaves (or 1/2 teaspoon dried), 1 tablespoon balsamic vinegar
- For the Sandwich: 4 slices sourdough or country style bread, 2 tablespoons unsalted butter softened, 1 cup (about 100 g) shredded Gruyère cheese, 1 cup (about 100 g) shredded mozzarella cheese, 2 teaspoons Dijon mustard
Instructions
- Step 1:
- Melt 2 tablespoons butter in a large skillet over medium heat. Add sliced onions, sugar, salt, and pepper. Cook, stirring occasionally, until onions are golden brown and deeply caramelized, about 25 30 minutes.
- Step 2:
- Stir in thyme and balsamic vinegar cook another 2 minutes until fragrant. Remove from heat and set aside.
- Step 3:
- Butter one side of each bread slice. Spread Dijon mustard on the unbuttered side of two slices.
- Step 4:
- Layer half the Gruyère and mozzarella onto the mustard side. Top with a generous spoonful of caramelized onions, then the remaining cheese. Place the other bread slices on top, buttered side facing out.
- Step 5:
- Heat a clean skillet or griddle over medium low heat. Cook sandwiches 3 5 minutes per side, pressing gently and flipping once, until bread is golden and cheese is fully melted.
- Step 6:
- Let rest 1 minute before slicing. Serve hot.
Pin this Required Tools
Large skillet, Spatula, Bread knife, Cheese grater
Nutritional Information
Calories 540, Total Fat 32 g, Carbohydrates 44 g, Protein 22 g
Category & Difficulty
Main Dish, Medium difficulty, American French Fusion cuisine, serves 2, Vegetarian
Pin this This sandwich brings a comforting and sophisticated flavor to your table perfect for cozy meals.
Recipe FAQs
- → How do I caramelize onions properly?
Cook thinly sliced onions slowly over medium heat with butter, sugar, salt, and pepper for about 25-30 minutes until golden and deeply caramelized, stirring occasionally to prevent burning.
- → Can I use other cheeses instead of Gruyère and mozzarella?
Yes, Comté or Swiss cheese can be substituted for Gruyère to maintain a similar creamy melt and flavor profile.
- → What bread works best for this sandwich?
Sourdough or country-style bread is ideal due to its sturdy texture and ability to crisp up nicely when grilled.
- → How can I add more depth to the onion flavor?
Add a splash of dry white wine to the onions while cooking for an extra layer of authentic French onion richness.
- → What are good side pairings for this dish?
Try serving it with tomato soup or a simple green salad for a balanced and satisfying meal.