Very very yummy! Thank you for posting this recipe. I, for some reason, have never thought to make tuna salad with mustard! I can't have dairy, and sometimes I don't feel like having the soy mayo, so this was johnny-on-the-spot :) I did add just a sprinkle of sweetener and extra black pepper for contrast and ate it over a salad. I imagine some chopped apples and jicama would be good with this as well. Thanks again!