2 qt whole milk
1 c plain yogurt
1 c half and half

Bring milk to boil.  Remove from hear, pour into glass jar.  dilute yogurt in 1 c cool milk and the 1/2 & 1/2.  Gradually add this mixture to the remaining milk, stirring slowly.  Place container, covered, somewhere safe.  Cover with a towel or blanket and leave overnight.  To make it thick, take off excess liquid with 3-4 paper towels.