Step 1

Measure out the powdered sugar into a sifter or a fine mesh strainer.

Step 2

Sift the powdered sugar into a large glass bowl. This sifting will ensure there are no lumps in the sugar. Add the salt, and whisk.

Step 3

In another small bowl, combine the vanilla extract and milk. Whisk them together.

Step 4

Pour the wet ingredients into the powdered sugar.

Step 5

Whisk until combined.

Step 6

Measure in the lemon juice, and whisk until smooth. (This will make 1 ¼ cups icing, and it will be relatively thin.)

Step 7

Use a measuring scoop to divide the icing as needed. (For 5 colors, use a ¼ cup measure.)

Step 8

Use the food colors of your choice to dye the icing, stirring with a spoon or a knife until the color is correct.

Step 9

Spread the icing thinly on top of the cookies, and let dry for 4-6 hours at room temperature before enjoying.