Old habits are hard to break. For years, there was only one way to cook asparagus—boiling. Now, cooks regularly roast and grill these tender spears. Roasting, in particular, releases the vegetable's lovely sweetness. Large asparagus are best for roasting and grilling because it is easier to gauge their doneness (and if you grill them, they won't fall as easily through the grill rack!). If you use slender, pencil-thin asparagus, simply reduce the roasting time accordingly. And, break the boiling habit!