Rhubarb braised pork, roasted parsnips and flower sprouts

I love a pot roast lamb shoulder with vinegar and onions but this does the same thing, the natural acidity of the rhubarb providing the perfect match for this delicious slow-roast pork. Similar to brussels sprouts (although a lot less dense) flower sprouts (also known as rosetti sprouts) roast well, giving a result similar to roasted kale or cabbage wedges, both of which make good substitutes.