You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: FOOD 
Clue: A popular health food, this soybean curd is used to make a variety of dishes & an ice cream substitute
tofu

Category: CUBA, SI! 
Clue: Turquino Peak, Cuba's highest, is in the chain known as this "Maestra"; California has one "Nevada"
sierra

Category: POTPOURRI 
Clue: Of Ketchupseed, Mustardseed or Onionseed, the one who's a fairy in "A Midsummer Night's Dream"

mustardseed