In a large skillet, heat 1/2 tsp of dark sesame oil over medium heat. Add the minced ginger and garlic, sautéing until fragrant, about 1 minute.
Stir in the finely chopped red bell pepper and scallions, cooking for about 3 minutes until they soften. Add the curry powder, red curry paste, and ground cumin. Cook for an additional minute.
Pour in the low-sodium soy sauce, brown sugar, Asian fish sauce, and light coconut milk. Stir everything together and let it simmer for about 5 minutes.
Preheat your broiler. Line a baking sheet with foil and spray it lightly with cooking spray. Place the tilapia fillets on the sheet, season them with salt, and brush the remaining 1/2 tsp of dark sesame oil over the top. Broil the fish for about 5-7 minutes.
Once the tilapia is cooked, carefully transfer the fillets to a serving platter. Spoon the coconut curry sauce over the top, and garnish with fresh cilantro. Serve immediately with rice or your favorite side.