For the biscuits, preheat the oven to 200C/180C (fan)/Gas 6 and line two large baking trays with baking parchment
Scatter the nuts over a baking tray and roast in the oven for 6-8 minutes, or until golden-brown
Watch them carefully so that they don’t have a chance to burn
Remove from the oven, tip onto a board and leave to cool
Put the butter and sugar in a large bowl and beat with a wooden spoon until light and creamy
Roughly chop the cooled nuts and add to the creamed butter and sugar, along with the lemon zest, flour and baking powder
Stir well until the mixture comes together and forms a ball – you may need to use your hands
Divide the biscuit dough into 24 even pieces and roll into small balls
Place the balls the prepared baking trays, spaced well apart to allow for spreading
Press the biscuits to flatten to around 1cm/½in thick
Bake the biscuits, one tray at a time, for 12 minutes or until very pale golden-brown
Leave to cool on the trays
They will be very soft when you take them out of the oven, but will crisp as they cool
Store in an airtight tin and eat within five days
For the fool, rinse the blackberries in a colander to wash away any dust or dirt
Put the blackberries in a non-stick saucepan and sprinkle over the caster sugar
Stir in the lemon juice and heat gently for two minutes, or until the blackberries begin to soften and release their juices
Remove and reserve 12 blackberries for decoration and continue cooking the rest
Simmer the blackberries very gently for 15 minutes, stirring regularly until very soft and squidgy
Remove from the heat and press the berries and juice through a sieve over a bowl, using the bottom of a ladle to help you extract as much of the purée as possible
Leave the purée to cool and discard the seeds
You should end up with around 325ml/11fl oz of purée
Put the cream and yoghurt in a large bowl and whip with an electric whisk until soft peaks form when the whisk is removed from the bowl – the acidity of the fruit will thicken the cream further, so don’t take it too far
When the purée is completely cold, adjust the sweetness to taste by adding more sugar if needed
Pour it into the bowl with the whipped cream and yoghurt and stir just once or twice until very lightly combined
Spoon the blackberry fool into individual wide, glass dishes – or one large, single bowl
It should look quite marbled, so don’t over-stir it
Scatter a few tiny mint leaves on top and decorate with the reserved blackberries
Sprinkle with a little sugar if you like and serve with the hazelnut biscuits