
When I was a kid we had cheese on toast, but never as a sandwich with a lid on. That came later, probably with the invention of the Breville™ Sandwich Toaster. I found them too greasy, but you don't need the machine, you can actually make them on a griddle or skillet. Just amazing!

4 slices sourdough bread
25 grams mature cheddar cheese
25 grams red Leicester cheese
25 grams brie or mozzarella cheese
half a small onion
4 tsp butter
2 tsp Dijon mustard