Mustard (condiment) tradition of mustard making, Dijon is regarded as the mustard capital of the world. The early use of mustard as a condiment in England is attested from the year 1390 in the book "The Forme of Cury" which was written by King Richard II's master cooks. It was prepared in the form of mustard balls—coarse-ground mustard seed combined with flour and cinnamon, moistened, rolled into balls, and dried—which were easily stored and combined with vinegar or wine to make mustard paste as needed. The town of Tewkesbury was well known for its high-quality mustard balls, originally made with ground mustard
Smoke ring (cooking) fuel source and that source's production of NO2. The highest concentrations of atmospheric NO2 can be achieved in a smoker through the utilization of charcoal briquets, or wood fires; both of which are capable of producing up to 200ppm (parts per million) NO2 in the cooking chamber. It has been suggested that greener woods produce more NO2, but are less suitable for cooking. Cooking "low and slow" is said to be key in the development of a smoke ring. This methodology, often cooking at temperatures under 225 degrees F for long periods of time, allows smoke to penetrate the meat