Pissaladière is an open, pizza-type onion tart from the south of France, flavoured with anchovies and black olives. The bread dough base is replaced here with simple toast.
Heat 2tablespoons of the olive oil and the butter together in a large frying pan. Add the onion and garlic and fry over a medium heat until tender and golden brown. Stir in the anchovies and olives, seasoning with salt and pepper.