Grapefruits are a member of the citrus family, like oranges and lemons, and grows on a similar tree. Grapefruit are large and yellow, but are not as sweet as oranges and have very thick skin, or rind. They come in two main colors, plain yellow with yellow flesh, and 'ruby', with reddish-pink flesh and darker skin. Grapefruits are usually squeezed for juice or cut in half and eaten for breakfast. The grapefruit in the picture are cut up ready for a lot of people to eat them for breakfast.