1 1/3 cups regular rolled oats
1/3 cup melted butter
1/2 cup brown sugar
2 cups water
1 1/4 cups sugar, divided
2 tablespoons lemon juice
2 cooking apples, peeled,cored,and sliced
3 tablespoons cornstarch
1 dash salt
1 cup half-and-half
2 tablespoons rum
1 cup raisins, soaked in warm water
sweetened whipped cream