In a medium bowl, toss the bok choy and pineapple with the cilantro, 3 tablespoons of the oil, ½ teaspoon salt, and ¼ teaspoon pepper. Let sit for 15 minutes before serving.
Meanwhile, heat broiler. In a small bowl, mix together the curry paste, sugar, the remaining tablespoon of oil, ½ teaspoon salt, and ¼ teaspoon pepper.
Place the salmon on a foil-lined broilerproof baking sheet and, dividing evenly, brush with the curry paste mixture. Broil until the salmon is opaque throughout, 5 to 7 minutes. Serve with the slaw.