This sandwich is sex on toast (again pun intended).
Ingredients:
2 slices of bread
1 tbsp caramelized onions
2 slices cheese
Salt & Pepper to taste
Toast the bread with some butter (optional). I used regular sliced bread, but I'd really recommend using a baguette for this sandwich. The crusty bread is perfect for the soft filling. Add the cheese slices to the open faced bread and microwave for 10secs. The aim is to soften the cheese so that its just about to melt. I used regular sliced cheese, but if you are in a mood to indulge Gruyère or Brie is what I would recommend.
Now spoon in the onions and bring the sandwich together. Et Viola!