1.

Roll out about 30 g of ivory flower paste to 4-5 mm. I used lolipop sticks as spacers (3 from each side). Leave the piece to dry for about 1-3 mins.

2.

Use a small amount of corn flour underneath the paste (so that it doesn't cling to the board). Cut out squares with a square cutter as shown in the photo (I used a 10 mm cutter). Make sure you press the cutter firmly all the way to the board. Move it around the board a bit as if you were trying to rub the edge of the cutter against the board - that way you will get a clan cut. You can also clean the edges with a smaller square cutter if there's need (press it to the corners).

3.

Cut the sides off leaving a few millimeter margin. Don't pull the knife - press it down all the way to the board. Clean the blade of the knife after each cut. I cut the corners a bit too, to make them less square.