Heat the grill to medium-high. Brush fish with olive oil and season with salt and pepper on both sides. Grill on one side until lightly golden brown, about 2 minutes, brush with some of the Pineapple Mustard Glaze. Flip over, brush with more of the Pineapple Mustard Glaze and continue grilling for 4 to 5 minutes, for medium doneness. Remove from the grill, brush with more of the Pineapple Mustard Glaze, place a tablespoon of the Cilantro Chimichurri on top of the fish, and serve Grilled Pineapple Salsa and Pickled Green Chiles alongside or on top.
Pineapple Mustard Glaze:
Combine the pineapple juice, vinegar, soy sauce, ginger, and brown sugar in a medium saucepan and bring to a boil. Reduce the heat to low and simmer until the volume is reduced by half, about 30 minutes. Add the mustard and cook an additional 2 minutes. Remove from the heat and add the lime juice, and white pepper. Let cool.
Combine all ingredients in a small bowl and season with salt and pepper.
Grilled Pineapple Salsa:
Grill the pineapple on both sides until lightly golden brown. Remove from the grill and cut into 1/4-inch dice. Combine in a bowl with the remaining ingredients and season with salt and pepper, to taste.
Pickled Green Chiles:
Place vinegar, salt and sugar in a small saucepan and bring to a boil. Continue boiling until the sugar and salt are completely dissolved. Place the chiles in a glass jar or nonreactive bowl and pour the hot vinegar mixture over.