Heat the oil in a large skillet and add in the chopped red and yellow peppers. Cook on a medium heat for two minutes, then add in the garlic, ginger, lemongrass paste and cooked turkey. Stir gently for one minute, then add in the curry paste. Stir to coat the chicken and allow to heat through for one minute.
Add in the coconut milk and stock and bring to a gently bubble (but don’t let it boil). Let it simmer gently for 10 minutes, then stir through the brown sugar, fish sauce and lime juice. Taste and add more lime juice if required, then turn off the heat and sprinkle over the chopped cilantro. Serve immediately with boiled rice, lime wedges and extra cilantro.