Di's Refreshing Lemon Myrtle Cordial

1 cup of combined lime/lemon juice or just lemon juice if preferred
4 cups water
1 1/2 cups white caster sugar
1 teaspoon citric acid(available from supermarket - herb section)
1 piece of lemon rind, tablespoon size
1 1/2 cups of lemon myrtle leaves, young/fresh

Wash all fruit and leaves before beginning.  Mix all the ingredients in a large saucepan, except the lemon myrtle leaves.  Boil and simmer for 3 minutes.
Remove from heat and add lemon myrtle leaves and steep for 3 minutes.
Remove the leaves, let the cordial cool and pour into a perfectly clean bottle and store in the fridge.
Dilute with iced water and serve with sprig of mint or a fresh lemon myrtle leaf.