A delightful twist on the classic grilled cheese, featuring caramelized onions and melted Gruyere cheese.
Heat the olive oil in a pan over medium heat.
Ensure the pan is hot enough to start cooking the onions immediately.
Add the sliced onions to the pan and cook, stirring occasionally, until they caramelize, about 30 minutes.
Stir the onions occasionally to prevent burning and ensure even caramelization.
Season the caramelized onions with salt, pepper, and butter, then remove from heat.
Adding butter at the end enhances the flavor and gives a glossy finish.
Assemble the sandwich by layering a slice of cheese, caramelized onions, and another slice of cheese between two slices of bread.
Layering cheese on both sides ensures the onions stay in place and the sandwich holds together.
Place the sandwich in a preheated panini press and cook until the bread is toasted and the cheese is melted.
If you don't have a panini press, use a skillet and press the sandwich with a heavy pan.
Serve the sandwich warm and enjoy.
Pair with a side of soup or salad for a complete meal.
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