Halve the avocados and spoon them out. Cut the flesh into cubes and mash it with a fork.
Sprinkle with the juice of the lime or lemon, so that the flesh does not discolour dark.
Add a crushed garlic clove and add salt and pepper to taste.
Tip: Add a hard-boiled egg, or a finely fried onion. This way you prepare a deliciously spicy butter on the bread.