I usually use the slow cooker for mine. I peel baby onions or shallots and brown them in a bit of oil, then put them in the slow cooker. I toss cubed shin or braising steak in a mix of flour, salt and pepper and mustard powder, before frying it in batches until it's brown. If there is any seasoned flour left, I add that to the pan after taking the last of the meat out, and fry it for a couple of minutes before deglazing the pan with a splash of dark ale from a 500cl bottle.
I put the meat, the juices from the pan with the cooked flour and the rest of the beer over the onions, and add a couple of thickly sliced carrots, and cook for 6 hours on low, resisting the temptation to remove the lid. When it's ready, I taste for seasoning and sometimes add a tablespoon of horseradish if I think it needs it. If it's not thick enough I add a tsp of Bisto powder (not the granules) mixed with a bit of water, stir it in and cook it for a bit longer to thicken.
I'm another who uses bought puff pastry and cooks it separately. I cut it to fit the top of the serving dish before cooking. Sometimes I add a pack of cooked chestnuts in the winter - they make it more seasonal, and are tasty.