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6 swordfish fillets, approximately 1 inch (2 ½ cm) thick |
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6 tomatoes, peeled, seedless, drained and chopped |
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1/3 cup basil leaves, chopped |
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2 tablespoons fresh marjoram, chopped |
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5 green onions (white part), finely chopped |
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3 tablespoons balsamic vinegar |
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Extra olive oil, if necessary |