1. While whipping the cold egg whites, when large bubbles appear, add all the sugar and whip. When the horns form to a certain extent, add cornstarch and whip at low speed until soft horns are formed.
2. Divide the meringue into 3 parts, add red and blue pigments in 2 places to color them, then stack them in the order of blue, pink, and white meringues in an oven pan and arrange them smoothly.