This recipe was devised when I found that the mushroom stalks from some fairly hefty sized Portobello Mushrooms, would just not fit into the stuffing mixture, even though they were finely diced! So, I made "chimney stacks" from the offending stalks and served them as a starter at dinner for some friends, who LOVED them! They would also be wonderful as a light lunch, allow two per person with fresh bread & salad. Do not be tempted to add ANY liquid to the mushrooms before baking them - they make their own gorgeous juices whilst merrily cooking away in the oven! You must also be sure to get very HIGH quality sausages or sausagemeat, with no more than 10% fat preferably.