Overnight oven pork ribs with smashed potatoes

Season the ribs, wrap in foil and put in a very low oven overnight, 200F / 95C.

Next day, parboil mini potatoes until soft.

Open the ribs; toss the potatoes with seasoning in the rendered fat and gently smash each one with a glass so it crisps.

Return to the oven at a much higher temperature to brown everything.

Slather the ribs with a ketchup-based barbecue sauce for the last couple of minutes and toss the potatoes.