1.Heat oil in a large flying pan on high. Saute onion 2-3 minutes, until tender. Add mushrooms and saute 3-4 minutes, until golden. Stir tomato paste through.
2.Meanwhile, cook pasta in a large saucepan of boiling salted water, following packet instructions. Drain, reserving 1/3 cup cooking water.
3.Pour cream into pan with mushrooms. Simmer 1-2 minutes, until thickened slightly.
4.Add pasta with reserved liquid, tuna, zest and juice. Season to taste and toss well. Toss parsley and parmesan through to serve.
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