Here's the recipe I use:
2 Tbsp sugar
1 cup half and half
1/2 tsp vanilla extract
1/2 cup salt
|Is usually smoother, was 100+ out & maybe needed to shake longer.|
1 pint-size Ziploc bag
1 gallon-size Ziploc bag
Combine sugar, half and half, and vanilla (I've also added a Tbsp of cocoa to the mix for chocolate), and seal it tightly.
Place the salt and ice in the gallon-size bag, then place the sealed smaller bag inside as well. Seal the larger bag. Now shake the bags until the mixture hardens (about 5 minutes). Feel the small bag to determine when it is done.
Take the smaller bag out of the larger one, add mix-ins, and eat the ice cream right out of the bag.