For perfect apple cubes: Stand the apple on your cutting board and cut down into four slabs; discard the core. Lay slabs, cut sides down, and cut into 1/2-inch slices, then crosswise into 1/2-inch cubes.
This was passed down from my mother. I don't know where she got it, but it was always a special request at brunches. Serve with maple syrup or apple butter.