This recipe really knocked our socks off. I normally steam or stir fry my bok choy, but I'll use this method any time I don't mind turning on the oven. I had a large quantity of the vegetable, so I quadrupled the recipe (except for the oil, which I didn't quite triple) with great results. I used the recommended substitution of sherry plus sugar for the mirin. I also subbed a pepper blend that included some hotter peppers along with the black for a little more of a kick. We loved the garlicky, piquant, fresh flavor. Outstanding!