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Onion cut into thin quarter rings. Chop greens. Tomatoes cut into halves.
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Combine the mustard, lemon juice, olive oil, wine, salt, pepper and mix. Add the onion to the marinade and leave for 10 minutes.
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Unfreeze the shrimps and put them for 2-3 minutes into boiling water.
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Of the mussels drain the marinade.
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Remove the tuna from the oil and mash with a fork.
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Mix seafood, tuna and onion with the marinade. Add the greens and stir.
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Place seafood salad on a dish, decorate with tomatoes, sprig of greens and serve.