Onions are schizophrenic. When raw, they are biting and harsh. In the company of fat, gentle heat, and time, they become sweet and yielding. While raw onions keep returning long after you've had enough, their caramelized counterparts leave you wanting more. Though caramelized onions play the leading lady role in French onion soup and pissaladiere, I like to use them as a condiment to dress up salads, sandwiches, and bruschetta.