Vegetable chip chips may be prepared with sliced vegetables that are fried, deep-fried, baked, dehydrated, or simply dried. Vegetable chips may be produced from a variety of root vegetables and leaf vegetables, such as carrot, turnip, parsnip, beet, radish, taro root, sweet potato, garlic, zucchini, cassava, kale, spinach, fennel and jicama, among others. Some baked versions utilize vegetables that are sliced, lightly tossed in oil, and then oven-baked until crisp. Vegetable chips prepared using this method have been described as more healthful compared to deep fried chips, particularly when prepared using "heart-healthy" olive oil. Simple versions are prepared by slicing vegetables and
Vegetable oil recycling which are sometimes compensated by cooking oil recyclers for their used deep fryer oil. Cooking oil recycling also results in less used oil being disposed of in drains, which can clog sewage lines due to the build-up of fats and has to be collected there as "brown grease" by grease traps. Vegetable oil refining is a process to transform vegetable oil into fuel by hydrocracking or hydrogenation. Hydrocracking breaks larger molecules into smaller ones using hydrogen while hydrogenation adds hydrogen to molecules. These methods can be used for production of gasoline, diesel, and propane. The diesel fuel that is produced