1.Cook pasta in large saucepan of boiling water, uncovered, until just tender; drain. Rinse under cold water; drain.
2.Meanwhile, cut asparagus into 5cm lengths. Boil, steam or microwave asparagus until just tender; drain. Rinse under cold water; drain.
3.Combine pasta and asparagus in large bowl with salmon, watercress and onion. Place remaining ingredients in screw-top jar; shake well.
4.Drizzle dressing over pasta; toss gently to combine.
Shell pasta, or conchiglie, is available in 3 sizes. In addition to the medium shell we used here, there is a smaller shell called conchigliette, which makes a great addition to soups, and a larger shell, called conchiglioni, which is usually served stuffed and baked.
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