Definitely the pickles, if it was me! You can put them in your rice balls or eat them on their own, or flavor other dishes with it...

[Hmm... a hand goes to her chin in an almost too obviously-thoughtful expression, humming in thought.]

But you said Master Zi Xi doesn't like vegetables, right? If he likes meat, my neighbor told me that if you stew them with pork that they go well together, so maybe you could trick him into eating healthier that way?