I like to make this in advance and then leave it in the oven to cool down completely. This seems to make the meat even softer, and then I just warm it up a bit on the stovetop to serve. This is a great one-pot meal that needs just the time to prepare and chop up the ingredients, and not much more attention from then on. You can use chunks of lamb or beef here, and throw in a couple of potatoes, cut up into chunks, with the beans, if you like. The green beans alone are also delicious cooked like this; still served with crumblings of feta that melt a little into the tomato sauce.