A process used extensively in cooking, caramelization is a technique whereby the oxidation of sugar results in an ingredient or group of ingredients yielding a sweet and nutty flavor and exhibiting a pleasing golden-brown color. In a phrase, caramelization is 'the coaxing of natural sugars to make food taste good.' And if you thought you absolutely couldn't learn to like Brussels sprouts, think again. Using the process of caramelization, the natural sugars found in the sprouts will help to both toast up and sweeten the sprouts. They take on a nice crispness and are altogether delightful when combined with the salty prosciutto and lemon-scented creamy ricotta for this very adult, very seductive holiday appetizer!