I'm good at roasts (so I'm told!lol). Like Wardy said, you can't be afraid of fat, because that's what makes it good and gives it flavour, although not TOO much of it. I'm not bad at stuffed peppers, and any kind of pasta dish either.
Always separate, because you (well I, really) never know exactly how long the meat is going to take. Then transfer the veg in the serving dish once the meat has rested, and pour a little gravy over it all. Yum!
Of course, you don't roast everything. Only potatoes and carrots, and parsnips (yuk). The rest, like sprouts,green beans or peas get either boiled for a few minutes or steamed.
Your roast sounds like mine, Wardy. I say mine..really it's Mr Ps, as he enjoys cooking roasts more than I do. He uses meat juices, fats etc in his gravy. And lard on his roast potatoes.
My signature dishes are usually something with rice. He cannot cook rice the way I do (perfection..always basmati, steamed). Maybe a chilli con carne or mexican chicken with fresh tomatoes and peppers.
Chilli con coction,make it like a normal chilli,put it in an oven proof dish,sprinkle with cheese then brown under the grill.Serve with salad and garlic bread.Yum.
I do a mean Roast too....bit of a tip...when roasting your potatoes in the juices from the meat....peel an onion and put it in with them.....yummy....and just baste the roasties as normal...gives them a lovely flavour :D
I also do a lovely Shepherds Pie, with cheesy mash...my grandaughter loves it.