The prawns in tomato sauce are one of the best dishes to come out of Margarita's kitchen. I say that with complete confidence and without much qualification. The sauce is rich and spiced and has a depth that takes time to build. The prawns absorb it properly rather than sitting on top of it. The dish has been on the menu since we opened and it consistently generates the kind of reaction that tells you something has been cooked correctly: the plate comes back empty and the tab