01 - In a large bowl, combine the chicken pieces with 1 tablespoon Jamaican curry powder, salt, black pepper, minced garlic, grated ginger, thyme sprigs, chopped Scotch bonnet pepper, and lime juice. Mix thoroughly to coat every piece. Cover and refrigerate for at least 1 hour, or overnight for deeper flavor penetration.
02 - Heat vegetable oil in a large Dutch oven or deep heavy skillet over medium heat. Add 2 tablespoons Jamaican curry powder and toast for 1 to 2 minutes, stirring constantly, until deeply fragrant. Watch carefully to prevent burning.
03 - Add the marinated chicken pieces to the pot, reserving any leftover marinade liquid. Sear the chicken until lightly browned on all sides, approximately 5 minutes, turning pieces as needed for even color.
04 - Add the sliced onion, chopped scallions, and chopped bell pepper to the pot. Sauté for 3 minutes, stirring occasionally, until the vegetables begin to soften and release their aromas.
05 - Pour in the reserved marinade liquid and chicken broth. Add the diced potatoes, thyme sprigs, and allspice berries if using. Stir everything together well, bring to a gentle simmer, then reduce the heat to low and cover the pot.
06 - Cook covered for 30 to 35 minutes, stirring occasionally, until the chicken is fully cooked through, the potatoes are fork-tender, and the sauce has thickened to a rich gravy consistency. Season with additional salt and pepper to taste.
07 - Remove from heat and garnish with extra chopped scallion or fresh thyme if desired. Serve hot alongside steamed white rice, Jamaican rice and peas, or fried plantains.