This idea is just too good not to share. Mark told me about it after they tried it with our children's Sunday School classes yesterday.
1 or 2 pint size zip lock bags
1/2 cup milk
1 Tablespoon sugar
a few drops vanilla flavoring
1 quart size zip lock bag
put the milk, sugar and vanilla into the pint bag.
seal well (you can place it into another sealed pint bag for good measure)
place the sealed pint bag into the quart bag along with ice and rock salt
squish the bag 5 minutes or longer if desired.
soft serve ice cream!!
You can experiment with your favorite additions, too.
This is so easy, preschoolers can handle the squishing part.