Having tried Heston Blumenthal's 20hr fore-rib of beef a week or two back, I thought I'd give a bone in pork shoulder a go with the very low and very slow this weekend. Well scored skin and a good rub down with olive oil, sea salt and fresh ground black pepper was the only help it had. I had the oven set at 65ºC (measured with a decent digital thermometer) and left the blade in there for 12 hours. Once the core temperature of the pork has reached 65ºC, it stays there and doesn't overcook at all... just gets very, very tender. I turned the oven up to 250ºC for a final 30 minutes (ish) to brown the outside off and crisp up the skin which I removed for this bit. Moist... succulent... tender... perfectly done... pick your own adjectives, it was gorgeous. Served it up with an apple gravy, roast spuds and broccoli.