Rhubarb Syrup:

Step 1: Put the rhubarb, caster sugar and water into a saucepan on a medium heat & bring to the boil. Reduce the heat and simmer until the rhubarb is soft.

Step 2: Set a sieve over a bowl & push the mixture through. Discard the rhubarb pulp (you could use this in a crumble!)

Step 3: Let the rhubarb syrup cool & transfer to a sterilised bottle & chill in the fridge.

Step 4: Measure 25ml of rhubarb syrup into a glass & add the chilled bubbly of your choice.

Step 5: Enjoy your rhubarb cocktail!