It's real simple actually. 1 liter of milk, 5 eggs, sugar to taste (1/2 to 1 cup if you like sweet), vanilla. Caramelise another 5-6 tsp of sugar in a baking pot. Mix everything else and pour in pot with caramelised sugar on bottom. Bake in water bath (place in larger pot with water) at 200C until top is brown. Well, depending on your oven... Experiment a little, it's a forgiving recipe. If you don't do in water bath, it develops flakes which chefs despise, but I don't mind. I see the Mexicans do it with condensed milk which makes it heavier. My mom (I come from Eastern Europe) used to make it in individual cups and then flip it so it looks like this (same recipe though):

Ah, the beauty of the electronics forum...