Thank you Becky Forrester and Tyrone Castell for sending in and sharing successful & fun educational activities.
This is what I buy for 2 classes of about 28 students.
3 gal. whole milk
8 pint of half and half
1 bag of sugar
6-7 containers of salt (26 oz.)
enough zip lock bags for each student to have: 1 sandwich bag and 1 quart bag. They have to be zip lock!
a cooler full of ice from the lunchroom
Mix together in a bowl
4 beaten eggs
4 cups half and half
2 teas. vanilla
1/2 teas. salt
Pour this mixture in an empty, clean milk jug. Fill it half full with the mixture, then fill the rest of the milk jug with milk. A funnel helps. Put the cap on the milk jug and have a student shake it (a lot). I have the students do everything except for the next part. Each student gets 1 zip lock sandwich bag and 1 quart zip lock bag. I pour approximately 1 cup of the mixture into the sandwich bag. I don't really measure, just eye ball it. The student must make sure most of the air is out of the bag and it is zipped well. Place the sandwich bag full of mixture into the quart bag, fill the quart bag with ice and salt well. Shake well and within a few minutes, they should have ice cream.
You could add chocolate or fruit to the mixture. Sometimes kids will have ice cream that tastes salty and its because they didn't zip well or their bag busted (air not pressed out). If the mixture is not solidifying, they don't have enough salt or ice. We love doing this during a short unit on eggs.