Oranges are widely grown in warm climates worldwide, and the flavours of oranges vary from to . The fruit is commonly peeled and eaten fresh, or squeezed for its juice. It has a thick bitter that is usually discarded, but can be processed into animal feed by removing , using and . It is also used in certain recipes as flavouring or a . The outer-most layer of the rind can be grated or thinly veneered with a tool called a , to produce orange . Zest is popular in cooking because it contains the oil glands and has a strong flavour similar to the fleshy inner part of the orange. The white part of the rind, called the pericarp or albedo and including the , is a source of and has nearly the same amount of vitamin C as the flesh.