Stuffed Vegetable Marrow

I’m a great devotee of stuffed marrow, and had been racking my brains how to make it a one-pot meal when a friend of mine said that she always cooked the marrow in the pan in which she had cooked the stuffing, so that solved that. And in fact if you add a little water to the pan, you’ll get a nice gravy to boot. I had some argument with myself, and indeed others, as to whether a vegetable marrow constituted a one-pot meal if you didn’t add extra vegetables, so I came up with a solution that