As far as I'm concerned, there are only two really important decisions in a cook's life: choosing a mate and buying a chef's knife. If that seems like an overstatement, you just haven't found the right knife. With a good knife — one that is sharp and stays that way; one that fits your hand like it was made for you — chores become a joy. Cuts are made cleanly and exactly as you intend, with only the slightest effort. Piles of fresh herbs are reduced to tiny confetti in a flash. Onions are diced before a tear can appear....