As he prepares to open his new restaurant, Commonwealth, in the coming weeks, San Francisco chef Jason Fox can't wait to make gazpacho. And why should he when juicy watermelon is an inspired substitution for still-ripening tomatoes? The chef's watermelon-based version is as refined and refreshing as Commonwealth itself, where culinary innovation will run headlong into deeply satisfying cooking. At home, this vibrant gazpacho will make a splashy dinner-party starter all summer long--so save those tomatoes for salad.