Cut the pineapple by cutting off its top and bottom, skin and rind. Chop half of the pineapple into small chunks and add it the pitcher.
Skin and chop mangoes as well and add them to the pitcher.
Juice remaining half of the pineapple and add fresh pineapple juice to the pitcher. (If the pineapple is nice and soft and you don't have a juicer, you can do it by hand.)