Make Ahead Tip: Refrigerate for up to 3 days; unmold just before serving.
Tip: Spirulina--dark green edible plankton--is sold in powdered form (bulk or in capsules) near vitamins and supplements. Once dissolved in water, it can be used in place of artificial food dye to add dark green color naturally to things like homemade jello desserts. To dissolve spirulina, place 1/8 teaspoon in a 2-cup glass measure. Slowly stir 2 tablespoons very warm water into the spirulina. Continue stirring until it's completely dissolved, then add 1 cup cold limeade. Proceed with recipe as written. Add more dissolved spirulina, if desired, for a darker green color.
54 calories; protein 1.7g; carbohydrates 12.5g; dietary fiber 0.4g; sugars 11.9g; vitamin a iu 37.1IU; vitamin c 10.1mg; folate 5.9mcg; calcium 9mg; iron 0.1mg; magnesium 3.2mg; potassium 35.3mg; sodium 5.7mg; added sugar 10g.