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Grilled Sweet Onion Sandwich Recipe

American · Main course · 30 min total

A savory, buttery sandwich featuring sweet caramelized onions and melted cheese, grilled to perfection.

Ingredients

• 2 large sweet onions (e.g., Vidalia), thinly sliced
• 2 tablespoons unsalted butter
• 1 tablespoon olive oil
• 1/2 teaspoon salt
• 1/4 teaspoon black pepper
• 1/2 teaspoon dried thyme (optional)
• 4 slices sourdough or country bread
• 4 slices provolone or Swiss cheese
• 2 tablespoons Dijon mustard (optional)

Instructions

1. In a large skillet over medium heat, melt 1 tablespoon butter with olive oil. Add sliced onions, salt, pepper, and thyme. Cook, stirring occasionally, until onions are deeply caramelized, about 15-20 minutes. Set aside.
2. Spread remaining butter on one side of each bread slice. Place bread butter-side down on a work surface. Spread Dijon mustard on the other side if using.
3. Divide caramelized onions evenly between two bread slices (butter-side down). Top each with 2 slices of cheese. Place remaining bread slices on top, butter-side up.
4. Heat a large skillet or griddle over medium heat. Grill sandwiches until golden brown and cheese is melted, about 3-4 minutes per side. Press gently with a spatula.
5. Remove from heat, let cool slightly, then slice in half and serve warm.

Tips

• For extra flavor, add a sprinkle of fresh thyme or a dash of balsamic vinegar to the onions during cooking.
• Serve with a side of tomato soup or a green salad.
• If using a panini press, cook according to manufacturer's instructions.

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