Special equipment: seven 6-inch skewers, soaked for 30 minutes if wood or bamboo
Preheat the broiler and line a baking sheet with a wire rack. Thread 3 shrimp onto each of seven 6-inch skewers and set aside.
Combine the coconut, lime zest, 1 teaspoon salt and a few grinds of black pepper in a shallow bowl. Brush the shrimp with the egg whites, then press into the coconut mixture until completely coated. Transfer to the prepared baking sheet and broil, flipping halfway through, until the coconut is crispy and golden brown and the shrimp are pink and no longer opaque in the middle, 3 to 4 minutes.
Meanwhile, blend the cilantro, red pepper flakes, garlic, pineapple and lime juice in a blender until smooth and vibrant green. Serve alongside the shrimp.
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