Place water, sugar, rind and mint into a saucepan. Stir over low heat until sugar dissolves. Bring to a simmer.
Add plums to saucepan. Place a circle of non-stick baking paper onto surface of plums. Cook for 6 minutes, or until just tender.
Use a slotted spoon to transfer plums to serving bowls. Strain syrup. Pour the syrup over plums. Allow to cool to room temperature. Serve.
