It is preferable to use cannelloni sheets or small lasagne sheets for this recipe. Dried cannelloni tubes end up with very little ‘bite’ and need a lot of liquid to cook, which can dilute the stuffing.
Pre-heat the oven to 200°C/400°F/Gas mark 6. Slice the mushrooms thinly. Heat the olive oil and cook the garlic and mushrooms in it. After a few minutes, add the tomatoes, marjoram, flour and seasoning. Continue to cook for 8-10 minutes until the liquid is reduced by a third. Taste and