1. Chop chipotles and garlic in a food processor. Add tamarind, brown sugar, and salt and puree. Add vinegar, 2 tablespoons water, and oil, and puree until smooth. Pour about 1/4 cup of glaze into a small bowl. Reserve remaining glaze for serving.
2. Preheat a grill to medium.
3. Brush salmon filets with oil and season with 1 tablespoon salt, to taste. Place fillets, top-side (rounded side) down, on grill. Cook until distinct grill marks appear, about 4 minutes. Turn fish over, lightly brush with glaze, and cook, brushing occasionally with more glaze, until firm but slightly pink, about 6 to 8 minutes. Transfer to a cutting board and brush with more glaze. Serve warm or at room temperature, and pass additional glaze, if desired.
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