Several strong flavours - anchovies, mustard and capers, give this hearty beef casserole a real kick. To make a deliciously easy mash, put four baking potatoes into the oven when you put in the casserole. Leave to bake for 2hrs. Cut each potato in half, and use a fork to scrape out the flesh into a bowl. Add 2oz butter and season well with salt and freshly ground black pepper - the potato will be soft enough to mash with the fork.