Seasoned Advice Asked on October 5, 2021
Hervé This discovered that one can make chocolate mousse with chocolate and water only.
This recipe is shown in this MasterChef video, and also detailed here.
Essentially, one melts chocolate with water, then whisks it over an ice bath to incorporate air bubbles, and after a while the mousse is formed.
Is this property unique to chocolate? Would this be possible, with, say, a strawberry purée?
Chocolate is a solid at room temperature, strawberry puree is not, so I strongly doubt that the strawberry would result in a foam.
The reason chocolate would form a solid foam is that it is largely composed of a two substances - sugar and fat. Together with the air these can form a solid of fats (similar to whipped cream) with microscopic sugar crystals helping keep it in place.
The only thing a strawberry puree would have that might reach similar consistency is the sugars. If you were to heat to a high enough heat that the sugars polymerize crystallise (like in candy), and whisk, you might get a structure like a mousse, but it would be crunchy.
Correct answer by bob1 on October 5, 2021
The beating of a liquid to a foam is not unique to a chocolate-and-water mixture. Neither is it something that works with any random liquid. What you need is an emulsion or a colloid which contains something that can hold the bubbles of the foam, and
Ferran Adria has created this very simplified diagram:
Translated from the "base" column, the diagram states that you need the proper amount of gelatin, fat, egg white or starch for a foam. The not-so simple version is that
The way you foam your food also matters, some liquids will foam with beating, others will require a siphon. Also, some foams are stable for a long time, others have to be served immediately before they liquefy again.
All in all, foams are a very complex topic, and for any given liquid that comes across your way, it is unlikely that you can just pick it and make it into a mousse. If you want to create foams, use a recipe, these are tested to work.
Answered by rumtscho on October 5, 2021
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