Makes about 8 3-ounce paletas:
6 oz (3/4 cup) Key lime juice – from approximately 20 Key limes or 6
regular limes
1 tablespoon Key lime zest
14 oz can (1 3/4 cup) sweetened condensed milk
8 oz (1 cup) plain Greek yogurt
Pinch of salt
2 or 3 cups crushed graham crackers