Dirty blueberry soda

Method

1. Put the blueberries in a saucepan over a medium heat and pour in enough water to cover. Bring to a gentle simmer and cook for 10 minutes.
2. Line a sieve with muslin or kitchen paper, then set over a jug or bowl. Pour the contents of the pan into the sieve. Leave until the liquid stops dripping into the bowl.
3. Gather up the muslin or paper and give it a squeeze to extract any remaining liquid from the solids. Pour the liquid back into the pan, add the sugar and simmer briefly (1-2 minutes) until the sugar has dissolved. Leave to cool.
4. Decant the syrup into a bottle or container and keep in the fridge until needed (see Make Ahead).
5. To make the dirty soda, fill a tall glass with crushed ice and a few blueberries, if you like. Add 25ml of the syrup, then top up with soda water. Splash in the cream and enjoy.