This marinade is perfect for seafood. Marinate at least 4 hours and up to 1 day, covered and chilled.
Whirl lemongrass in a food processor until finely chopped. Add shallots, chiles, ginger, and garlic and whirl until minced.
Put lemongrass mixture in a nonreactive baking dish and whisk in salt, coconut milk, and lime juice and zest. Add seafood and turn to coat.
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