Condensed Milk Chocolate Syrup Fudge
Source: Hershey's Recipe Book, 1930

2 cups sugar
1 can Hershey’s chocolate syrup
1/4 cup sweetened condensed milk
1/4 cup water
1 tablespoon butter
1 teaspoon vanilla

Mix all the ingredients but the butter and vanilla together and heat to the boiling point, then cook slowly to the soft-ball stage, remove from the fire and add the butter and leave to become quite cold. Then add vanilla and beat till creamy.