Fill sandwich bag with half & half, sugar, vanilla and chocolate syrup. Smoosh to combine ingredients.
Zip bag closed removing as much air as possible.
Add rock salt into large bag with ice.
Place smaller bag with liquid inside larger bag and remove as much air as possible and zip closed.
Shake or toss bag for 5-10 minutes until the ice cream sets up.
Remove smaller bag from larger bag and squeeze ice cream into a bowl. Enjoy!
Video
Notes
What is half and half?Half and half is a mixture of half whipping cream and half whole milk. If you can't find half and half where you live just substitute with whipping cream and whole milk.