In the two-stage or two-bath method, the first bath, sometimes called blanching, is in hot fat (around 160 °C / 320 °F) to cook them through. This may be done in advance. Then they are more briefly fried in very hot fat (190 °C / 375 °F) to crisp the exterior. They are then placed in a colander or on a cloth to drain, salted, and served. The exact times of the two baths depend on the size of the potatoes. For example, for 2–3mm strips, the first bath takes about 3 minutes, and the second bath takes only seconds. There are several common techniques to cook French Fries. Deep frying is a cooking method in which food is submerged in hot fat, most commonly oil. Vacuum fryers are fit to process low-quality potatoes that contain higher sugar levels than normal, as they frequently have to be processed in spring and early summer before the potatoes from the new harvest become available. In the UK, a Chip pan is a deep-sided cooking pan used for deep-frying. Chip pans are named for their traditional use in frying chips.