As requested, the recipe for the Friendsmas 2009 dessert, courtesy of the Prima Domestica Goddess herself, Nigella Lawson.
Gin and Tonic Jelly
300ml plus 50ml water
300g caster sugar
zest and juice of 2 lemons
400ml tonic water (not slimline!) (that's Nigella's comment, I assume she means diet)
8 sheets of leaf gelatine
2 punnets of whitecurrants or 3-4 punnets raspberries, optional (I used blueberries as that's what was in season and looking good)
1 teaspoon icing sugar if using raspberries
1.25 litre jelly mould, lightly greased with almond or vegetable oil
Put the water and sugar into a wide, thick-bottomed saucepan and bring to the boil. Let boil for 5 minutes, take off the heat, add the lemon zest and leave to steep for 15 minutes. Strain into a measuring jug, then add the lemon juice, the tonic water and the gin; you should have reached the 1200ml mark; if not, add more tonic water, gin or lemon juice to taste.
Soak the gelatine leaves in a dish of cold water for 5 minutes to soften. Meanwhile, put 50ml of water into a small saucepan and bring to the boil. Remove from the heat, squeeze out the gelatine leaves and whisk them in. Pour some of the gin and lemon syrup mixture into the saucepan and then pour everything back into the jug. Pour into the mould and, when cold, put in the fridge to set. This should take about 6 hours.
When you are ready to unmould, half-fill a sink with warm water and stand the jelly mould in it for 30 seconds or so. Clamp a big flat plate over the jelly and invert to unmould, shaking it as you do so. If it doesn't work, stand it in the warm water for another half-minute or so and try again. If you've used a dome mould, surround the jelly with whitecurrants or fill the hole with them if you've used a ring mould. Raspberries are just as good, but dust these with icing sugar - it sounds poncey, but it makes the pale-jade glimmer of the jelly and the otherwise-too-vibrant red of the fruit come together on the plate. The whitecurrants should be left to glimmer, opal-like, without interference.
Variation: To make a vodka and lime jelly, simply substitute 6 limes for the lemons and use vodka in place of the gin.
My notes: This is definitely a "make the day before" dessert. Also don't stand the mould in warm water for too long as this is a very soft wobbly jelly. It is also quite alcoholic as the gin is never heated so doesn't lose any alcohol.