Mashed Sweet Potato with Melted Leeks
Luxuriously silky leeks--slow-cooked in butter and seasoned with lemon juice and thyme--ripple through sweet potatoes. Feel free to substitute ordinary potatoes if you prefer.
Cut up sweet potatoes can be held submerged in water in the refrigerator overnight. Drain and use as directed. Leeks can be prepared ahead and refrigerated for up to 4 hours. When ready to use heat until just warmed through.