Before I left for Paris I cooked intestines, also called chitterlings. I bought them from pork supplier in the market and they had the mesentery attached. This is a photo of them soaking in cold water. I had read about the mesentery in Jane Grigson's Charcuterie and French Pork Cookery
The intestines were delicious and quite mild. We ate them in a spicy tomato sauce with chickpeas. I didn't cook up the mesentery as Ms Grigson advises, but I will the next time.