Preheat the oven to 170 ºC fan.
While your parfait is setting nicely in the freezer, you can start making the crumble. Put all the ingredients together on your work surface or in a bowl and knead them together quickly with your hands. Make sure you don't knead too much, we don't want a dough, but lots of small crumbs. So you really only need to knead briefly so that everything comes together a little and then it's more like breaking up the dough than kneading it. The important thing for this step is that the butter is really cold. If the butter is too soft, you will end up with a very soft, homogeneous dough and no small crumble. In this case, however, you can wrap the dough in cling film, put it in the fridge for an hour and then either tear it apart like a normal crumble or grate it with a very coarse grater.
Spread the finished crumble on a baking tray lined with baking paper and bake in a preheated oven for 5-8 minutes. During baking, the crumble may flow together a little as the butter softens and you will end up with several larger crumbles. However, this is not a problem, simply leave them to cool down long enough after baking and then you can easily crumble them between your fingers.
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