Chop off the ends of the lotus root.

Peel off the skin.

Cut into easy to handle sections. (If they are too thin, they will break when slicing, so they should be on the thick side.)

Make shallow cuts around the edge between the holes.

Using a knife, diagonally carve into the shallow cut from both sides.

Even out the sharp edges to make a flower shape.

Slice into desired thicknesses, then they're done!