P426ORACLE 426 Mon 2 Dec C4 1702:05       Monday, Decemaer 2, 6.00pm Tonight's programme brings us to the penultimate course, as the six master cooks continue their meal around a table at the Dorchester Hotel. This week Kay Avila talks to Jane Grigson, cookery writer for The Observer, who divulges some valuable secrets on the cooking of vegetaales. Viewers might also like to know that a new series of Take Six Cooks will be beginning in January.  4 Women...443 