Boston Cream Pie (Light Sort of)

Directions

1. 1
   Heat the milk in a pan until very hot, then briskly stir in the granulated sugar, flour, and salt.
2. 2
   Cook over moderate heat, stirring constantly, until very thick.
3. 3
   Add the egg yolks and cook, continuing to stir, for another 4 to 5 minutes.
4. 4
   Removed from heat, add the vanilla, and cool, stirring occasionally.
5. 5
   Cover well and refrigerate until ready to use.
6. 6
   Spread the custard between the cake layers and dust the top of the cake with confectioners' sugar.
7. 7
   Keep refrigerated.