Cooking oil from restaurants and households can be recycled into biofuel. This is an environmentally friendly way to dispose cooking oil, while producing cost-efficient sources of fuel. To be turned into biofuels such as biodisel, cooking is first filtered then processed and heated. Biofuel can be used to fuel engines for cars, trucks, and farm and construction equipment. Demand for cooking oil has increased to the point that it now costs about 40 cents per pound, giving rise to a thriving trade in stolen cooking oil.