Butter	tbsp
Yellow Onion	g
Red Wine Vinegar	tbsp
Gruyère Cheese	g
Sourdough Bread	slices
Salt & Pepper to taste

1. Peel the onions and cut into fine strips. Grate the cheese.
2. Heat up a large skillet with 2 tablespoons butter over medium high heat. Add the onions and season with salt and pepper. Cover and cook, stirring once or twice for 3-5 minutes, until the onions are softened. Uncover, reduce the heat to medium-low, and cook for 20-25 minutes, stirring occasionally, until deep golden brown.
3. Deglaze the skillet with vinegar and cook until the liquid has evaporated, about 1 minute. Transfer the onions to a medium bowl and season to taste with salt and pepper.
4. Add the cheese to the onions and stir to combine.
5. Heat up a medium skillet with 1 tablespoon butter over medium high heat. Scoop the cheese onion mixture on 2 slices of bread and top with remaining slices of bread. Press down gently.
6. Grill the sandwiches for 3-4 minutes, until the bottoms turn golden brown. Add the remaining 1 tablespoon butter, flip the sandwiches, press down and grill until the cheese has fully melted and the bottoms turn golden brown as well.

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