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Peel and pit the mango, and puree the flesh.
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Combine the puree with the nectar, mustard seeds, 3 prepared mustards, vinegar and salt in a suacepan.
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Simmer for 20 minutes, stirring occasionally.
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Let cool, then puree in a blender or food processor.
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At this point, you can stop and refrigerate or freeze the mango-mustard sauce n (You'll have about 1 cup, and you can keep it in the fridge for about 5 days).
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Spread the salmon fillets with about 1/2 of the glaze and broil, grill, or bake (at 450) for about 12 minutes per inch of thickness.
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Midway through the cooking, rebaste with 1/3 cup of the glaze.
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Test the salmon at the thickest part to ensure doneness; when done, drizzle with the remaining glaze and serve.