Per Unit. Tarragon is a versatile herb that’s widely used in French cuisine. A popular and versatile herb, tarragon has an intense flavour, a unique mix of sweet aniseed and mild vanilla. The leaves are narrow, tapering and slightly floppy, growing from a long, slender stem. It’s a key herb in French cuisine (an essential ingredient in Béarnaise sauce) and goes very well with eggs, cheese and poultry.