And so to foam. Having come all this way (48 posts and counting) without touching on the trend for ‘molecular mixology’ seems remiss, so let’s correct that right now.
Having been warned off the use of dry ice after recent horror stories in the UK, and not having any scientific background or interest in what is really just a gimmick, cocktail foam is about the only element of molecular mixology that can be easily and relatively safely approached by the amateur. While the use of a rotovap or calcium bath does appeal (the former more than the latter), the costs are somewhat prohibitive at this stage, and so we stick to foam.
There are a number of ways to create cocktail foam, and recipes differ on whether you should use egg white and elbow grease (or Aerolatte), or gelatine and N2O or a combination of the lot.
Your choice will most likely be influenced by the resources and ingredients you have to hand, but my preference is for a hybrid recipe:
- Dissolve half a packet of gelatine in warm water and add 30g of sugar until it dissolves.
- Allow the mixture to cool.
- Add 25ml egg white and your flavouring – in this case I used a large measure of absinthe.
- Pour the mixture into your soda siphon/cream whipper and charge with two capsules of N2O (leave the second one in)
- Refrigerate for at least an hour.
To dispense the foam, shake the siphon until no movement can be felt inside and slowly layer the foam on top. Keep the siphon in the fridge when you’re not using it.