Gruyere Grilled Cheese with Caramelized Onions

Heat one tablespoon of olive oil in a skillet over medium heat. Add the sliced onion and sprinkle with salt and sugar. The sugar is to help with the caramelization and the salt sweats the onion out a bit, as well as balances the sugar. Cook, stirring frequently, until the onions are browned, about 20-25 minutes.

Take two pieces of bread; line one side with sliced cheese. Then distribute some onions over top and top with another piece of bread. Brush the outside pieces with olive oil and return to the pan. I recommend placing another pan on top of the sandwich in order to squash it down a bit. Cook the sandwich until the bread has browned, about 2-5 minutes. Flip over and repeat. Transfer to a plate and dig in!