1. Cook the pasta in salted water until half done.
2. Make a béchamel from the butter, flour and milk.
3. Stir in the sliced mushrooms, peas and drained tuna.
4. Add the pasta, season with salt and pepper, and pour into a baking dish.
5. Sprinkle with grated cheese and bake at 180°C until golden.
Tip: A handful of crumbs under the cheese gives a crisp top.
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