I clipped this from last Sunday's newspaper and we had it for lunch today. I used extra cheese and creme fraiche so there was a little liquid run off when I plated it, and I just realised as I was typing it up that I only used 1 tsp of cornflour. I used a 425g can of tuna, and everything else as listed. We found the the dish to be quite tasty with a slight sour cream taste, and very satisfying.