Combine shrimp. 2 Tbsp. fish sauce, 2 Tbsp.oil, and turmeric in a large bowl; toss to coat. Let stand for 30 minutes.
Puree 4 Tbsp.fish sauce, 2 Tbsp. oil,cilantro,and remaining ingredients in a blender or food processor until a coarse mixture foms;transfer dipping sauce to a small bowl and set aside.
Build a meduim-hot fire in a charcoal grill, or heat a gas grill to high. Oil grill grates. Shake excess liquid from shrip and place shrip on grill. Cook,turning occasionally, until shrip are charred and cooked through, 5-6 minutes.
Serve immediately with sauce.
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Grilled Shrip with Chile, Cilantro, and Lime recipe