Soapy! that's interesting. I seem to recall that you've found cilantro soapy-tasting as well, I wonder if it's the same taste receptor. (Though Barb is cilantro-avoidant as well, and she loves quinoa as much as I do.)

Sometimes I make quinoa with part water, part chicken stock -- 1 part quinoa to roughly 1.75 parts total liquid. Chicken stock might help with the soapiness?