Put the frozen strawberries and icing sugar into a tall mixing bowl and let it thaw for about 10 minutes. For the chocolate topping, divide the chocolate into pieces and melt in a hot water bath. Leave to cool for about 5 minutes.
Pour the cream into the strawberries and puree everything in a blender or hand blender until creamy (if the strawberries are still too hard, let them thaw for another 2-3 minutes).
Cut 4 large balls out of the strawberry ice cream with an ice cream scoop and serve. Right away.
Pour some liquid chocolate over it and sprinkle with pistachios. Let it set for a short time and serve.