Raspberry Pistachio Biscuits

Name: Raspberry Pistachio Biscuits
Prep time: 25 min
Cook time: 20 min
Total time: 45 min
Cuisine: British
Ingredients: 85 g whole roasted pistachios; 150 g plain flour (all-purpose); 80 g light brown sugar; 1 pinch fine sea salt; 1 tsp baking powder; 1 tsp pure vanilla extract or 1/2 tsp of vanilla paste; 100 g melted butter; 2 tbsp milk; 100 g fresh raspberries (see notes); 50 g caster sugar; 2 tsp cornflour (cornstarch); 100 g dark or milk chocolate