The tarte à l'oignon (onion pie) is a traditional dish found at formal dinners in Haiti, especially around the Holidays. This version adds the onions at the last minute, but feel free to brown your onions before adding the flour to the Mornay sauce (creamy filling).
In a pan, melt the butter over low heat
Add the flour and cook for about 2 minutes
Remove from heat
Slowly mix in the milk and water stirring vigorously to avoid lumps
Return to the stove, and cook at low heat while stirring until the mixture thickens
Incorporate the grated Tête de Maure
Roll out the pie crust in a pie pan
Dust the crust with flour
Pour the sauce over the pie crust
Top with the onion slices
Bake at 350 until the pie turns golden (30 to 35 minutes)