Caramel Popcorn-- yummm

Mom's Recipe- the best, of course, I've ever had.  It is soft and delicious-- not the crunchy kind, which has its place.

3/4 c. white sugar

3/4 c. brown sugar

1 cube margarine (I use butter)

1/2 c. Karo syrup (light)

1/4 c. water

1/8 tsp. cream of tartar

Cook to soft ball stage (I drop small amount in cold water to cool quickly and see if it is the consistency I'd like).  Add 1/4 tsp soda.  Beat and pour over popcorn (I use 2/3 c. kernels of corn)