• 5 tablespoons all purpose flour 
• 3/4 cup brown sugar 
• 1/2 teaspoon salt 
• 2 cups scaled milk 
• 3 egg yolks 
• 3 tablespoons butter 
• 1/2 teaspoon vanilla 

Mix flour, brown sugar and salt thoroughly in top of double boiler. 
Add 1 cup of the scaled milk and stir over direct heat until smooth; add remaining milk, then place over boiling water. 
Cook, stirring constantly until thick and smooth (about 5 minutes); continue cooking for 10 minutes longer, stirring frequently. 
Beat egg yolks thoroughly; stir in a little of the hot mixture into the beaten yolks, then pour back all at once, into double boiler, stirring quickly. 
Cook for 3 minutes longer, stirring constantly. 
Remove from heat, add butter and vanilla and stir until mixed. 
Allow to cook before putting between layers of cake. 

Yield: enough for large layer cake.