3: Prepare and slice 300 g button or field mushrooms. Reserve.
4: Prepare and chop 1 onion. Heat 3 tablespoons olive oil in a large saucepan on medium heat. When good and hot, add the onion, salt and pepper. Cook for 1 or 2 minutes without colouring.
5: Add the sliced mushrooms...
6: ...and mix well. Cook for about 5 minutes until the mushrooms are soft.
7: Add 200 g tuna in oil.
8: Then add 200 g cream and mix well. Check the seasoning and take off the heat. Preheat the oven to 430°F (220°C).
9: Spread the mixture over the bread-dough base, then bake...
10: ...for about 30 minutes.
Remarks
This recipe can be varied in lots of ways, with different toppings as the mood takes you.