Hold the mango with one hand and use a sharp knife to cut off one side of the mango, following the curve of the fruit's pit. Repeat on the other side. Hold one of the halves of the mango with the skin side down on a cutting board. Score the flesh of the mango in a criss-cross pattern with a sharp knife. Use a spoon to scoop out the cubes of mango, starting from one end of the scored fruit. Repeat with the other half of the mango. If there is still some flesh left on the pit, you can peel it off with a knife and cut the remaining mango into cubes as well. You can also peel the entire mango using a paring knife. Then cut off one side of the mango, following the curve of the fruit's pit. Repeat on the other side. Now chop the flesh into cubes.