Try freezing egg yolks. Separate the yolks from whites and stir gently. When frozen, egg yolks can thicken or become gel-like. To guard against this, mix in 1/8 teaspoon salt or 1½ teaspoons sugar per every four yolks. Strain and pour into a container. Attach a label with the number of egg yolks and date. One tbsp. of the yolk mixture equals one egg yolk.I got this from ehow. Hope it helps!