3 egg yolks
1/2 c. sugar
3 tbsp. flour
1 c. milk
1 tsp. dark rum
1 tsp. vanilla
1/2 c. whipped heavy cream

Whisk together yolks and 1/4 cup sugar, then blend in flour. Combine milk and remaining sugar in a medium saucepan; place over medium heat, and heat just until mixture comes to a boil. Pour half of the hot liquid over yolk mixture, stirring to combine. Pour yolk mixture back into saucepan; bring to a boil, stirring constantly. When thick and smooth, remove pan from heat and pour custard into a large bowl to cool. Cover surface with plastic wrap; refrigerate. When ready to assemble, stir in flavorings, then fold in cream.