Dreams of mustard denote trust in a positive outcome, your belief and connection to a higher power. Your dream is giving you the message that if you have faith the size of a mustard seed you can move mountains. See Yellow and Condiment.... Strangest Dream Explanations
(Mustard; Money; Poison) In a dream, mustard means poison.
If one eats mustard in his dream, it means that someone may poison him, or that he may fall into a vicious circle, or acquire an evil reputation. It also means that he may receive clean money, though through awesome hardships. Mustard seeds in a dream only denote good if seen by a physician. Otherwise, for the majority of people, seeing mustard or sesame seeds in a dream means a sickness, a fever, or poison.... Islamic Dream Interpretation