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Put the kettle on to boil. Tip the spring greens into a large heatproof bowl and cover with boiling water from the kettle, then leave to stand for 2 mins to soften slightly. Drain well, then tip onto a plate lined with kitchen paper. Spread the greens out in a single layer so the paper can absorb as much of the excess water as possible. Leave to cool for 2 mins.
Meanwhile, toss the parsley, quinoa and red onions together. Mix in the spring greens, then scatter over the cheese and toss gently with your hands to combine.
Whisk the lemon zest and juice, the mustard and rapeseed oil together in a jug to make a dressing. Pour this over the spring green salad and toss gently to combine. Tip the salad onto a large serving platter or spoon into individual bowls and scatter over the walnuts, if using. Serve immediately.