Take claypot with lid of appropriate size, wash and keep aside for drying. Combine ginger, garlic with fish stock in the claypot and cook, covered on Microwave HIGH (100%) for three minutes.
Add salt, peppercorns, sugar, soy sauce, white wine, spring onions along with the greens and fish to the above mixture, cover and cook on Microwave HIGH (100%) for ten minutes. Let it stand for five minutes. Serve hot.