Clean: Clean exterior of watermelon well and dry it thoroughly.
Halve: Use sharp knife to slice watermelon evenly down the middle, crosswise, so that the stem-end is still intact.
Remove Rind: Take one half of the watermelon and slice off the round end, so that it now has two flat sides. Turn it large cut-side-down on cutting board. Slice the rind off, all around.
Slice: Turn rind-free watermelon half on its side, and slice it into 1-inch large rounds.
Cube: Stack the slice rounds and cut into cubes. Repeat with other half of the watermelon.
Equipment
1 Chef's Knife
Notes
Watermelon tends to slice easier when it's very cold to begin with.