What term for excellent cookery is derived from a Blue Ribbon worn by members of a French Order of Knighthood?

The term you're looking for is "cuisine." It is derived from the French term "cuisinier," which refers to a chef or cook, and is associated with the prestigious Blue Ribbon worn by members of the Order of the Holy Ghost, a chivalric order in France. The blue ribbon symbolizes Excellence, which has come to signify high-quality cooking and culinary skills in general.