Mix the ginger, coriander, turmeric, and garlic powder in a medium bowl. Heat 2 tablespoons of the oil in an 8-inch skillet over low heat. Add the spices to the hot oil and heat until they bubble and become fragrant, 30 to 60 seconds. Return the spice blend to the bowl; stir in the chile paste, brown sugar, and salt. The mixture will be thick and pasty. Add the chicken and toss to coat evenly.

In a medium bowl, mix the mango, bell pepper, peanuts, scallions, cilantro or mint, jalapeno, and the remaining 1 tablespoon oil. Add the lime juice to taste. Set aside. (You can season the chicken and make the salsa up to 2 hours ahead and refrigerate.)

Prepare a hot charcoal fire or heat a gas grill with all burners on medium high for 10 minutes. Clean the hot grate with a wire brush and then lubricate it with an oil-soaked paper towel. Put the chicken on the grate and grill (covered on a gas grill or uncovered over a charcoal fire) until one side has dark grill marks, 5 to 6 minutes for large thighs or 4 to 5 minutes for medium and small thighs. Turn and continue to grill until well marked on the other sides and cooked through, 5 to 6 minutes longer for large thighs or 4 to 5 minutes for medium and small thighs.

Move the thighs to a platter, let rest 4 to 5 minutes, and serve hot, warm, or at room temperature with the salsa alongside.

Variations: To prepare as kebabs: Trim the thighs and then slice them lengthwise into 1-1/2- to 2-inch-wide strips. Toss with the flavorings; then thread the chicken onto six 8- or 12-inch skewers (soak wood skewers in water for at least 20 minutes first), folding each strip in half as you skewer it. If some strips are very thick, cut them in half crosswise rather than folding them so that all the pieces of chicken are roughly the same size. Grill the kebabs, turning them every 4 to 5 minutes as dark grill marks form, until cooked through, 12 to 15 minutes total