Potatoes are naturally low-fat, and are full of nutrients. Potatoes should be stored in a cool, dark spot away from onions (which can make them sprout). Potatoes can be stored for 2-3 weeks. While potatoes are incredibly versatile, the most popular choice of preparation is mashed. To get smooth mashed potatoes with no lumps, use a potato ricer. This kitchen gadget looks like a large garlic press and gives you smooth, airy mashed potatoes. Mashed potatoes can be prepared ahead and kept warm in a crock-pot.