Braised Fennel and White Beans (with Potato)

I searched for fennel recipes to use veggies from my CSA and came across this one for Braised Fennel and White Beans.
I followed the recipe except  I added some potatoes (in order for Ebon to eat any of it), braising greens, and I forgot to add the butter and red wine vinegar at the end. I used a vegetable stock that I made. It took a bit longer than I thought (because of the potatoes) but turned out pretty tatsy. I think the butter and vinegar would have added to the flavor.