Slice peeled hard-boiled eggs in half; scoop out and reserve the yolks in a bowl. Pat the egg whites dry with a paper towel. On a shallow plate, mix 2 tbsp. water and 5 to 10 drops gel food color, then dip the cut sides of the egg whites into the color for 5 to 10 seconds. Remove and let dry completely. In a small bowl, combine 1/4 cup water and 5 to 10 drops of a different food color. Fully submerge the rounded sides of the whites into the color, remove after 5 to 10 seconds and let dry. Meanwhile, mash the yolks with a bit of mayo, mustard and 5 to 10 drops of a third color. Spoon or pipe the yolks back into the whites and serve.Get quick and easy recipes for dinner tonight! Start now!