Warm the nduja and oil in a saucepan, then add the tomatoes. Let it simmer over fairly high heat – the tomatoes should break down completely. Season with a little salt and freshly ground pepper.Meanwhile, cook the pasta al dente according to the packet instructions.
While that cooks, cut the salmon into very small cubes – no more than 1x1 cm.
Drain the pasta and toss it in the hot nduja mixture.
Add the salmon cubes and toss well with the pasta. The salmon only needs to warm through briefly – turn the heat down if necessary.
Finally, fold in the chives, keeping a little back for the top if you like, season to taste with salt and freshly ground pepper and adjust the consistency with a splash of the pasta cooking water if needed.
Serve with plenty of freshly ground pepper on top and grated Parmesan, if you like.