Step 1: Use your line icing to ice the outline of a thin, blue rectangle in the centre of your circular biscuit. Then, use the red line icing to ice around the rest of the circular edge, before adding two smaller curved lines closer to the middle and joining them. You can use the image below as a rough guide. Then let the icing dry for around 10 minutes. Now you have the ‘walls’ to contain your flood icing, so it won’t escape.