Braised Veal or Beef shanks Osso Bucco is real comfort winter food with  tender meat simmered in a flavourful red wine sauce. The marrow in the shanks provides an additional rich flavour to the sauce. One Rusty Jack Osso Bucco Simmer Sauce encapsulates all the traditional flavours of this Italian classic. To add the final touches, top it off with a gremolata mix.