Mixed Berry Cooler
Put the strawberries and sugar in a small pan and heat gently until the strawberry juice begins to run and the sugar has dissolved. Pass the mixture through a fine sieve and let the juice cool.
Divide the raspberries and blackberries between 4 glasses and gently crush them with the handle of a wooden spoon.
Add the strawberry juice, fill the glasses with crushed ice and top with still or sparkling water. Stir well and serve.