Cook your rice (see instructions). In a large pot over medium heat, add the oil and curry paste and cook for 1 minute, stirring often (to toast the spices). Reduce the heat to medium-low and add the white and light green parts of the scallions and ginger and cook until softened, about 2 minutes, stirring often to prevent burning. Stir in the veggies and salt and cook for 2 more minutes, stirring often.
Stir in the coconut milk, water, chicken, fish sauce and soy sauce. Bring to a boil, then reduce the heat to low and simmer, uncovered, for 10-15 minutes, or until veggies are tender and chicken is cooked through, stirring halfway through. Remove from heat and stir in the lime juice. Taste and add more salt or lime, if needed.
Serve over rice and top with green parts of the scallions, lime wedge and other herbs, if using.