Of course there is, because it's on the menu of that nice asian place that's within walking distance of the offices of everyone working on the Unicode Standard. For all that talk about inclusion for the pregnant man/pregnant person, the exclusion on things as basic as food is baffling. It's very nice that you can express "pregnant man" with an emoji. It's very weird that you can't express "furnace".
I love how your reasoning for the inclusion of Bok Choy is because there are Asian restaurants in SF, rather than the fact that it's one of the most popular vegetables in the most populous country on Earth.
Technically if you "search" your emojis for "bok" and then "lettuce" the same emoji appears. My first guess was that bok choy meant "leafy green" but it means "White Vegetable". I actually had this discussion yesterday, otherwise i wouldn't have known bok choy was an emoji at all.