Original Colmans Classic Mint Sauce. British Mint from Colmans Of Norwich. A ready to use mint condiment sauce. Try this Pair with succulent roast lamb and enhance the flavour of your favourite Sunday roast with British grown mint. An essential condiment for lamb dishes, Colmans Classic Mint Sauce is made with British grown mint leaves that have been finely chopped and soaked in vinegar. An essential condiment for lamb dishes, Colmans Classic Mint Sauce is made with British grown mint leaves that have been finely chopped and soaked in vinegar. Aside from its traditional associations with roast lamb, Colmans Classic Mint Sauce can be added to yoghurt to produce a lovely mint raita, and also works really well when eaten with mushy peas!