What Is Prepared Mustard in a Recipe?

A prepared mustard includes mustard seeds, vinegar and spices, and it is about half the strength of dry mustard. A recipe that calls for prepared mustard usually specifies what type or flavor. Possible choices include Dijon mustard, sweet mustard and yellow mustard, among other varieties specific to geographic regions. Yellow mustard is also referred to as American mustard. The mild flavor of yellow mustard makes it an appropriate choice if the recipe does not specify what type to use.