Step 1: 1. Bring water and sugar to the boil in a saucepan and simmer for 2 minutes then leave to cool to a syrup.
Step 2: 2. Blitz the raspberries and lemon juice with a blender then push through a sieve.
Step 3: 3. Add the cold syrup mixture and stir to combine.
Step 5: perfect with cheesecake and ice cream!