Get a slice of your favourite bread (if in doubt, you can’t beat a good sourdough) and butter both sides.
Add a layer of Rubies in the Rubble pink onion and chilli relish. Grate some cheddar on top (if you’re feeling fancy, use half cheddar, half gruyère).
Then add the top slice of bread (again, with both sides buttered), and whack in a hot frying pan until the cheese is melted and the bread is golden. Flip to toast on the other side.