When the weather gets hot, our mortar and pestle becomes a fixture on the kitchen table. The familiar rhythmic sound of pestle-striking-mortar fills the air and the pungent aroma of garlic wafts through the house. Aïoli. It's aïoli time. The word, aïoli, comes from the French word for garlic--ail--and the Occitan word for oil—òli—the two primary ingredients in this deliciously simple Provençal dish. So ubiquitous is this sauce on tables in Provence that it is also known as "the butter of Proven...