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Whisk together the grapefruit zest and juice, oil, vinegar, sugar and dill to make a dressing. Mix half with the prawns and allow to marinate for 10 mins.
Just before serving, gently toss the cucumber, shallots, frisée and rocket with the remaining dressing. Add a pile to each of 6 starter plates, along with the prawns and grapefruit segments. Scatter over the pomegranate seeds and serve.