PASTRY: Heat water, salt and butter to a rolling boil; reduce heat. Tip in the flour and stir vigorously over low heat until mixture forms into a ball, about 1 minute.

Remove from heat. Add in the eggs, one at a time, while beating until dough mixture is smooth.

Heat oven to 400°F Fahrenheit.

Use rounded teaspoonfuls (to tablespoonfuls, depending on the size you like) or use a piping bag to make mounds of dough set about 2 inches apart on an untreated cookie sheet.

Bake puffs until they are puffed and golden brown, 20 to 30 minutes. Cool.

Split each puff halfway and put in the custard filling (recipe below).

CUSTARD FILLING: Beat yolk and sugar until white. Pour in milk bit by bit while mixing until sugar is melted.

Put in flour, cornstarch, vanilla and mix until smooth.

Cook over medium heat, stirring constantly until mixture boils and is thick.

Cool before putting into puffs.

Bon Appetit!