This paper presents an ongoing work for allowing users to ask questions in natural language to a database management system on the domain of recipes. The system translates questions from Italian language to SQL exploiting an interlingua represented by a logical formalism such as relational calculus. There are two specific features of this project: first, the use of relational calculus as semantic representation for interlingua translation; second, the role played by pragmatic information, that is the Mediterranean diet domain implicitly encoded in the database schema.