Whisk the egg whites and lemon juice in a large mixing bowl until the mixture is bubbly.

Gradually add the sifted confectioner's sugar while whisking the mixture continuously until it forms a thick and shiny texture. This should take around 7-10 minutes.

If the icing is too thick, add a little water to thin it out, but do so slowly to avoid making it too runny.

Divide the icing into separate bowls and add your desired coloring gel. Mix well.

Once the icing is the desired consistency and color, transfer it to a piping bag or use a spoon to spread it onto your baked goods.