This fun STEM snack idea from Kiwi Co has a “wow” factor thanks to the fact that red cabbage acts as a pH indicator. In other words, it will turn acids (like lemon juice) pink. Just like that, a glass of yellow lemonade becomes a glass of pink lemonade!
First, soak about 1 cup torn red cabbage in 1 cup very warm water. Add 1 cup sugar, stirring until dissolved. Let stand for about 30 minutes. Strain the cabbage mixture through a fine-mesh sieve over a cup. Set aside.
In a second cup, whisk together 1/2 cup lemon juice and 1 cup cold water.
Pour a little cabbage mixture into a glass and add ice. Fill with the lemon mixture, then start to stir as you add the remaining cabbage mixture.
Note: The kids declared that the lemonade tasted a little “funny”, which is no doubt the result of a little cabbage flavor. So you may find that this drink works more as a novelty than as the best glass of cold lemonade your kids will ever have.