A mango can be a little intimidating to cut, since it has a large, flat seed that runs almost its entire length. Start by cutting off the very ends of the mango to determine the seed's orientation. Next, cut the flesh away from each side of the seed, getting as close possible to the seed to create two "filets." Cut parallel lines down the flesh side of each filet, being careful not to pierce the skin on the opposite side. Turn the filets 90 degrees and repeat the parallel cuts to create a grid. Press the skin to invert each filet and pop the cut fruit out, then cut the cubes from the skin to remove.