Just fill a sandwich bag with
  • 1/2 c. whole milk,
  • 1 heaping tablespoon sugar,
  • and a 1/4 teaspoon vanilla.

Then get a bigger plastic bag and fill it with \

  • 3 cups crushed ice
  • and 1/3 cup salt.

Put the little bag in the big bag and shake/knead it for 10 minutes or until thickened. Open and eat!