Gravy with this recipe?

[tigerbread20]

Having a last minute family dinner tomorrow, I’m going to do this marinade on pork belly slices, mash potatoes, cabbage and green beans.
I want some kind of sauce, do we think gravy would work? If not what should I make?

www.myallergykitchen.com/easy-tuscan-inspired-pork-belly-low-fodmap/

I would make a simple tomato based sauce to serve with that , maybe with some paprika and herbs

I don't like any sort of tomato based sauce with potatoes. I would just go gravy. Maybe an apple cider based one?

Can you make a traditional gravy with the juices from the meat, a bit of flour and some white wine or cider?
I can't see beef bisto working.