Makes 2 bottles
adjust servings:

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  1. Place the raspberries, blackberries, sugar and lemon juice in a heavy-bottomed saucepan and simmer over a medium heat until the fruits have broken down. Allow to cool slightly, then pour through a sieve, gently pushing the juice through.
  2. Pour the liquid into a clean saucepan and add the soda water. Taste for sweetness and add more sugar if needed. Simmer gently until the mixture becomes a syrup.
  3. Leave to cool. Add the vodka, if using, then pour into sterilised bottles.

Nutrition Facts

Per serving: (1/4 bottle, made with vodka) 147kcals, 0.7g fat (0.1g saturated), 29.8g carbs (23.6g sugars), 1.4g protein, 5.9g fibre, 0.014g sodium