Tapenade is a thick paste of olives, anchovies, garlic, and a combination of herbs and seasonings. It originated in the Provence region of France, but its popularity has spread throughout southern Europe, and it is now made everywhere that olives are grown. The paste can be smooth or chunky, but we prefer a mixture with some texture. Processing the topping in a blender or food processor in place of the traditional mortar and pestle makes for a quick and easy tapenade. Serve with a basket of crostini, small slices of toasted bread that have been brushed with olive oil, to top with the tapenade.