Prepare the mint.
Break off the leaves from the tough stems.
Wash them well in a number of changes of water.
Cut off the roots from the coriander.
Spread it out on the chopping board or a plate and pick out any mushy, black leaves.
Wash the rest well.
Chop the mint and coriander roughly.
Put them into the grinder along with the rest of the ingredients.
Add the juice of 1 lime and as little water as possible.
Taste and see if you need more lime juice or any other ingredient.
Chill till needed.