Step 1

Cook the pasta in a large saucepan of salted boiling water following packet directions or until al dente. Drain and return pasta to the pan.

Step 2

Meanwhile, melt the butter in a saucepan over medium-high heat. Add the flour and cook, stirring, for 2 minutes or until bubbling. Gradually stir in milk until smooth and well combined. Cook, stirring constantly, for 5 minutes or until mixture simmers and thickens.

Step 3

Add sauce to the pasta with the tuna, spinach and sundried tomato. Season well. Toss to combine. Transfer mixture to a 22 x 29cm (base size) baking dish.

Step 4

Preheat an oven grill on high. Sprinkle cheese over the pasta mixture. Grill for 5 minutes or until cheese is melted and golden. Serve.