For 200 years we have been putting it on our roast beef and our pork pies, and to celebrate Colman's Mustard in Norwich have released a set of archive photos.
Click below to watch Kate Prout's report:
More top news
Rain this evening with showers expected tomorrow and minimum temperatures overnight of 9 deg C 9 66 deg F)
Early fog will clear to leave a dry day with sunny spells and highs of 18 deg C (64 deg F)
Overnight there'll be mist and fog but it will clear for Sunday leaving sunny spells.