Use a peeler to remove the whole outer skin of the mango and discard.
Stand the mango up now so that you are looking down on the top, where the stem was. Using a paring knife, cut down against the flat sides of the pit (the pit is almost impossible to cut anyway). You’ll have two “halves” or “cheeks” now cut from each side, which can be cut up further to create smaller pieces for serving.
Now slice the other two sides the same way being careful to avoid the pit; try to cut along the curve of the pit to get the most fruit in one piece. You will likely still have a lot of fruit surrounding the pit, which will just need to be creatively sliced away to create more pieces.
Notes
Sliced mango will last for up to 3 days in a container in the refrigerator.