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At the Fat Duck they serve a mug of hot and iced tea. The drink is served in a single cup yet the two different temperature drinks stay separate side by side with no barrier between them.

I believe this is done by using fluid gels rather than liquids but how do you actually make this. What gelling agent would you use and in what quantities? How would you actually get it into the cup maintaining separation?

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This is done, and explained in the Big Fat Duck cook book, by creating a hot fluid gel and a cold fluid gel and then fitting a tight divider down the centre of the glass. Fill both sides equally, remove the divider, serve immediately.

you can follow the link and 'look inside' to see the page which has the recipe for this on to see exactly how to do it. search inside for 'hot and cold tea', then its on pages 274 and 275, so just follow those links.

The gelling agent used is gellan F, and making the gels requires making two parts for each and mixing them together. The details of the recipies are not availabale at the amazon.com site, only amazon.co.uk, although you can access it from outside the uk

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I know you're probably reluctant to reproduce the entire recipe but you might want to mention the specific agents that are used in each. –  Aaronut Sep 5 '11 at 14:00
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I second Aaronut's suggestion for reproducing some of the details. While the text/prose of a recipe is protected under copyright, at least in the US (not sure about the UK) the individual ingredients and proportions are not copyrightable. –  ESultanik Sep 7 '11 at 17:25
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