Preheat oven at 350 degrees Fahrenheit (180 degrees Celsius)

Prepare a round 9 inch pie dish or pan by greasing it and sprinkling some semolina flour.

In a bowl mix the semolina flour, sugar, 1 cup cold milk, 3 eggs, vanilla and zest until smooth.

Heat the rest of the milk and add to flour mixture and mix. Transfer to a heavy pot.

Place pot under low heat and mix with a wooden spoon until the mixture thickens (about 10 minutes). Be careful not to let the custard burn.

Once the mixture starts to bubble, continue heating and mixing for 2-3 minutes.

Remove from heat and add 1 tablespoon butter. Mix until butter melts.

Let the custard cool for about 5 minutes.

Pour mixture in the pan or pie dish.

In a small bowl beat the other egg and brush on top of pie.

Bake for about 45 minutes until surface starts to brown.

Remove from oven and let the pie cool completely.

Serve with a sprinkle of cinnamon and powdered sugar.