Mix the parmesan, onion, mayo, and Worcestershire sauce together.
Preheat your oven to 475 degrees
Spread the mixture on the bread slices, sprinkle each with salt and pepper.
Bake for about 10 minutes, watch carefully so they do not burn. When they are golden brown, remove from the oven and sprinkle with dill. Let rest a few minutes and cut into two bite squares.
