So I have yet to try this, but its intriguing. Materials 1/2 cup milk 1/2 cup whipping cream (heavy cream) 1/4 cup sugar 1/4 teaspoon vanilla or vanilla flavoring (vanillin) 1/2 to 3/4 cup sodium chloride (NaCl) as table salt or rock salt 2 cups ice 1-quart ZiplocTM bag 1-gallon ZiplocTM bag themometer measuring cups and spoons cups and spoons for eating your treat! Procedure Add 1/4 cup sugar, 1/2 cup milk, 1/2 cup whipping cream, and 1/4 teaspoon vanilla to the quart ziplocTM bag. Seal the bag securely. Put 2 cups of ice into the gallon ziplocTM bag. Use a thermometer to measure and record the temperature of the ice in the gallon bag. Add 1/2 to 3/4 cup salt (sodium chloride) to the bag of ice. Place the sealed quart bag inside the gallon bag of ice and salt. Seal the gallon bag securely. Gently rock the gallon bag from side to side. It's best to hold it by the top seal or to have gloves or a cloth between the bag and your hands because the bag will be cold enough to damage your skin. Continue to rock the bag for 10-15 minutes or until the contents of the quart bag have solidified into ice cream. Open the gallon bag and use the thermometer to measure and record the temperature of the ice/salt mixture. Remove the quart bag, open it, serve the contents into cups with spoons and ENJOY!