Portuguese style egg filling

As promised, eventhough a little bit late, below is the recipe from a friend, tested on my tart's shell:

225 gm sugar, (i used half of this, and yet i think i need to further reduce, well to your likings of course)
500 ml whipcream ( i used non-dairy)
200 ml UHT milk
6 egg yolks
4 whole eggs
1 tsp vanilla

Mix all well, slow cook until the mixture thicken a little bit. Pour in your tart shells.. Thats it. Oh yes, got to bake the whole tarts again till egg fillings turn brown.