This looks like a millionaire's shortbread, but it's very different. Don't be put off by the 'wet sand' look while you're making it up. It's really quite delicious. I want all my sandcastles to taste like this!
Preparation Time: 10 minutes
Cooking Time:20 minutes (plus a couple of hours setting times)
Makes: About 30 squares - you can slice them small as they are quite rich
Ingredients 150g butter
200g dark chocolate, or milk chocolate, or a mixture of 250g Digestive biscuits
200g soft light brown sugar
300g crunchy peanut butter (or smooth)
1 tsp vanilla
Line a square or rectangular tin with baking paper. i t should be about 20cm long, but a slightly different size will just give a different thickness peanutty layer and chocolate topping.
Put the butter in a pan and melt it slowly over a low heat.
Use a blender to whizz up the biscuits and sugar into a fine-grained sand.
Take the butter off the heat and tip in the biscuity mixture, then add the peanut butter and vanilla extract and stir well until combined.
Melt the chocolate in the microwave or in a bowl over a pan of simmering water. You can use all dark chocolate, or a mix of dark or milk. If I'm making this for children, then I use a bit more milk.
Meanwhile, press the peanut butter mixture down into the base of the tin. I use a potato masher to make sure it's packed in very tightly.
Take the chocolate off the heat and spoon it over the peanut butter and biscuit mixture. Tip the tin from side to side to make sure it is spread evenly.