Put the two types of milk in a saucepan. If you use full fat milk instead of sweetened condensed milk try adding some more sugar to the final mix to bring up the sweetness.
Simmer the milks on a very low heat.
Caramelising the milk can take a long time, up to an hour or more. Try for 40-45 minutes. An alternative method is to boil the condensed milk in the can for the same amount of time. It doesn’t take as much effort to keep an eye on the milk. Simmering the milk in a saucepan will definitely produce a better flavour however.
Whip the egg yolks and then add the caremalizing hot milks to the bowl. Beat thoroughly for about 20 seconds and then pour everything back into the saucepan with the vanilla. This makes the famous Dulce de Leche as it’s known in many Spanish speaking countries. In Peru they call it manjar blanco. You might also see manjar blanco referred to as blancmange.
Next mix the port/pisco with the sugar and cook (bringing to the boil) in a saucepan until the mix becomes quite thick.
Beat egg whites in a separate bowl.
Add this sticky syrup to the egg whites and beat with a spoon until it starts to look like whipped cream.
Add mix of sugar and egg white to the top of the manjar blanco in cups or bowls.