Pistachio kataifi

Pistachio kataifi is the crunchy layer made famous by Dubai-style chocolate. In a cake it adds texture against soft sponge and cream. The most common failure is that the crunch disappears and the layer turns chewy. The real cause is water: from steam, from a damp neighbouring layer, or from kataifi that was not fully fried.

Ingredients and what each one does

• Kataifi is shredded phyllo dough. It is thin strands of dough with almost no fat, so frying turns it into a brittle, crisp mesh.
• Butter is the frying medium. It carries heat above the boiling point of water and drives moisture out of the strands. It also gives the nutty flavour.
• Pistachio paste gives the flavour and some of the binding. It is mostly nut fat, which stays crisp-friendly because it contains no water.
• White chocolate is the binder. Cocoa butter sets when cold, so it glues the strands into a layer you can cut. It also sweetens the paste, which is usually unsweetened. How sweet you want it is a matter of taste, so try and weigh.

How to make it

1. Pull the kataifi apart and cut it into short strands. Long strands tangle into a mat, and you cannot cut or bite through it cleanly.
2. Melt the butter in a wide pan over medium heat and add the kataifi. The butter foams while the water in the dough boils off, so keep stirring until the foam dies down and the strands smell nutty and turn an even golden colour. This usually takes 5 to 10 minutes (our estimate, so watch the colour, not the clock). Pale strands are still holding water and will go soft.
3. Spread the fried kataifi on a tray and cool it completely. Warm kataifi steams in a closed mixture and melts the chocolate unevenly. Sign: the strands snap when you break one.
4. Melt the white chocolate gently, keeping it below roughly 45 °C. This is a general rule for white chocolate, which scorches and thickens more easily than dark. Sign: smooth, fluid, no lumps.
5. Stir the pistachio paste into the chocolate, then fold in the kataifi. The binder should only coat the strands, not drown them, so add the kataifi until the mixture holds together when pressed. If it looks like a wet paste, there is too much binder. The exact ratio is a matter of taste and texture, so try and weigh.
6. Press it evenly into a thin layer (about 0.8 cm) in the tin or on the cake. Chill until firm so the chocolate sets, usually 20 to 40 minutes.

What can go wrong

• Soggy, chewy layer. Kataifi was under-fried, was mixed warm, or the layer touches wet cream or soaking syrup. Fry to a deeper gold and cool fully. Put a thin barrier of chocolate or ganache between this layer and anything moist. The crunch still fades over time, because the neighbouring layers keep giving up water.
• Greasy and heavy. Too much butter stayed on the strands. Drain the fried kataifi on paper before mixing.
• Seized, grainy chocolate. A drop of water or overheating. Do not rescue it by adding more paste. Start with fresh chocolate and lower heat.
• Rock-hard, hard to cut. Too much white chocolate, or the layer is very cold. Use less binder and let it stand a few minutes before slicing.

Substitutions

• Clarified butter (ghee) has no milk solids, so it browns less and gives a cleaner, less toasty flavour.
• Hazelnut paste instead of pistachio gives a different but equally workable filling. The structure is the same, since both are nut fat.
• No kataifi? Thin vermicelli-type pastry, broken up and fried the same way, can work. Try and weigh, as the crunch will be different.

Storage

Keep it airtight in the fridge. It is crispest on the day it is made, and the crunch fades over the following days once it is in a cake. Bring it out of the fridge for a few minutes before cutting, as cold white chocolate is hard.