I'm looking for vietnamese mint. With big 2 inch leaves. Green on the top purple on the underside. I'm so confused. I'm looking for what vietnamese chefs like. I don't believe it's the coriander type or balm all I know it's its characteristics. And that is that the leaves are big and green on the top and purple on the underside.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!