In a bowl, whisk eggs with milk, zests and vanilla. In another bowl, mix flour with sugar. Gradually add the liquid preparation to the dry ingredients. Whisk until obtaining a smooth pastry.
Butter eight ramequins with a capacity of 250 ml (1 cup) or a 25 cm (10 inches) pie plate. Divide the preparation between the ramequins until a third of the height is reached, or pour it into the pie plate.
Bake the ramequins in the oven for 15 to 17 minutes. Cook the pie plate for 20 to 25 minutes.
Remove from oven and cool down. When serving, spread icing sugar with a sieve, if desired. Garnish with fruits.