Using your flood icing fill in the tomato shape. Start with a dot of green a the top, then add in a curved yellow line underneath and finally fill in with the red flood icing. If you have air bubbles pop them with a cocktail stick. Whilst the icing is still wet, use a cocktail stick to drag the tip through each colour. The longer you drag the stick through the icing, the longer the detail will be, we call this technique feathering. Pop the biscuits in the oven on a baking tray, set the oven to the lowest temperature it can go (usually around 50°C) for 40 minutes.