1. First prepare a piece of lettuce, peel and clean it; cut the lettuce into slices with a diagonal knife at an angle. You can adjust the thickness of the slices appropriately according to the angle of the diagonal knife.

2. First remove the hard skin from the lettuce and wash it. Cut the peeled lettuce into two parts crosswise, then place the cut sections cut side up on the cutting board, and then cut into thin slices with a knife.