Butterscotch Pie
1 cup firmly packed brown sugar
1/2 cup flour
1/4 tsp salt
1 12 oz. can evaporated milk
4 eggs yolks, at room temp
1/2 stick butter, cut into pieces
1 tsp vanilla
1 baked 9-inch deep dish pie shell
Prepare filling by combining brown sugar, flour, and salt in a mixing bowl. Add enough water to evaporated milk to make 2 cups. Lightly beat egg yolks and then whisk in 1/2 cup of the diluted milk. Whisk in the yolk mixture until thoroughly mixed and then add the remaining milk.
Transfer mixture to the top of a double boiler and cook over medium heat, whisking constantly for 10-15 minutes or until very thick. Remove from heat and stir in butter and vanilla. Cover surface with a round of wax paper or parchment paper. Cool for 15 minutes, then pour into cooked pie shell. Cover with a new round of paper, cool to room temperature, then refrigerate for about 3 hours or overnight.