To serve at least 16 – this is a very rich tart, you will not need very much
Here is an expression of the gradual erosion of chocolate. Fergus notes that the increasing challenge of finding a chocolate bar that does not contain salt is an example of a good idea going too far. For years his loyalties have lain solidly with Cadbury’s Fruit and Nut Bar – affectionately called ‘Fnerr’. But of late, he laments, he has begun to recognise its rough edges. Fergus and Fnerr have parted ways. In spite of (or maybe evidenced by) a little recent saturation, the combination of chocolate, caramel and salt
is still a good idea, and so here is our tart. A very rich tart, you will not need very much.
200g plain flour
45g cocoa powder
7g bicarbonate of soda
180g demerara sugar
25g caster sugar
5g Maldon sea salt
225g unsalted butter, softened
225g dark chocolate, chopped finely –
the pieces should be smaller than
a chocolate chip
225g caster sugar
70g unsalted butter, cut into chunks
80ml double cream
500g double cream
400g dark chocolate, broken into pieces
Sea salt, for sprinkling
First make the tart case. It is easiest by far to use a machine for this. Mix together the flour, cocoa powder, both sugars and the salt, place in a food processor with the butter, and whizz until a loose dough forms. At this point add the chocolate and mix again. Wrap in cling film and allow to rest for half an hour or so.
If you are making the pastry any further in advance, take it out of the fridge in good time – you need the softness of room-temperature dough for it to work. When ready, butter and flour a tart case and roll the pastry between two sheets of baking parchment – the shards of chocolate would tear cling film, but the dough is too sticky to be rolled loose. Line the case with the pastry, rolled to around 4mm thick, line the pastry with foil or cling film, fill with baking beans and bake in a medium oven for 25 to 30 minutes.
When you remove the case from the oven, wait 10 minutes before removing the beans, otherwise the hot, soft pastry may tear. Once you have done so, press the base and sides all over with the back of a spoon while it is still warm – the aim here is to smooth the interior ready for the caramel, pushing down the inside corners which may have risen and rounded a little in the baking.
Once the case is cool, make your caramel. It is essential to move quickly when the caramel is ready, so ensure that all your ducks are in a row before you start. Place the sugar in a scrupulously dry pan and melt over a medium high heat. Do not stir! Stirring will result in a crystallised disaster. Swirling the pan a little is allowed. By the time the sugar has dissolved you should have a good colour, trusting that it can be quite dark and still be comfortable. Throw the butter in first and follow with the cream, whisk them together quickly and, at the very moment that they are smoothly incorporated, pour it into the case immediately. With speed, pick up your tart case and move it around, tilting it to ensure that the caramel covers the entire base. Leave aside to cool.
Finally, heat the cream with the glucose and take it just shy of a simmer. Place the chocolate and butter in a bowl and pour the hot cream over the chunks in three stages, stirring gently to incorporate – the first will melt the chocolate, the second will loosen the mixture and the third will make the smooth ganache. Then pour the chocolate mixture into the tart and leave to cool and solidify. Sprinkle with a little sea salt and serve with crème fraîche.
Extracted from The Book of St John by Fergus Henderson and Trevor Gulliver (Ebury Press, £28 hbk) Photography by Jason Lowe
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The Book of St John: Over 100 Brand New Recipes from London’s Iconic Restaurant
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