Bring the thread through at the top left of the shape, carry the thread across and take a stitch on the right side of the shape with the thread below the needle (A). Take a stitch at left side, thread above the needle (B).
These two movements are worked until the shape is filled. Keep the stitches close together. The size of the center crossing stitch can be varied, either to make a longer slanted stitch or a small straight stitch.