...or never remember, depending on how much you give them.
Ingredients (pro rata):
2 litres Porter beer (London Pride, Guinness, etc...)
2 sachets of vanilla sugar
[My own addition: a few spoonfuls of syrup e.g. golden syrup, etc...]
One cup of ordinary sugar (or more, for taste - I used quite a lot)
250ml-500ml wine spirit (90%, from most chemists), depending on the strength you would like
One bottle of vodka - optional, depending on the amount you require
Take a very large cooking pot or cauldron and pour, ever so carefully, the beer into it. Heat it up, stirring constantly, but DO NOT let it boil. Add the vanilla sugar, the syrup and the sugar. Stir continually until the sugar disappears and the foam is no longer.
Leave it to cool.
Once it is totally cold, pour the wine spirit into the pot. Here is the moment to pour in the bottle of vodka, as this will give you more for the amount you made, but as I said in the list of ingredients, everything is pro rata.
Mix the ingredients very well, and pour into bottles. It is possible to use the same night, but for the best possible results, wait six months. If you do it now, it'll be ready in time for the Christmas season!