MARINADE: Before starting the marinade, keep in mind that you'll remove 3/4 cup of it before adding it to the chicken. In a large bowl, combine the 2 tablespoons soy sauce, 2 tablespoons honey, 2 tablespoons olive oil, 1 tablespoon lime zest, 1/4 cup lime juice, 2-3 cloves minced garlic (add to preference, we add 3), 1 teaspoon ground cumin, 2 teaspoons ground coriander seed, 2 teaspoons salt (or to preference), 2 teaspoons yellow curry powder, 1/8 teaspoon cayenne pepper if using, and 1/2 cup coconut milk. (Stir the coconut milk until well integrated before measuring). Whisk all the ingredients together and remove 3/4 cup (for the sauce) and place in the fridge. Pat the chicken breasts dry with a paper towel. Halve thick breasts horizontally and pound the chicken breasts with a meat mallet or the bottom of a frying pan. We don't want to make the breasts thin, just the same thickness throughout to ensure even cooking. Place chicken breasts in a large plastic bag and pour the remaining marinade over the chicken. Knead to coat the chicken, seal the bag without any air, and refrigerate. Marinate for 2-8 hours.
PREPGRILL: Make sure the grill grates are clean and greased. Once the grill is preheated to 400 degrees F, dredge a paper towel in vegetable oil and holding it with tongs, rub it all over the grate.
GRILL: Grill the chicken until completely cooked through (about 4-6 minutes per side, depending on the heat of the grill and thickness) Chicken should be at 160 degrees F at its thickest part (carryover heat will bring it to 165 degrees). For 1-inch thick breasts grilled at 400 degrees, it takes generally 5 minutes on the first side and 4 minutes on the other side. Use a metal spatula to remove the chicken to a plate and cover immediately with foil to rest for 5-10 minutes.
RICE: Combine 1 cup basmati rice, the remaining coconut milk (there should be 1 and 1/2 cups), 1/2 cup water, and 1/2 teaspoon salt (or to taste). Stir and place over high heat. Once boiling, reduce the heat to low and cover the rice. Allow to simmer for 13-18 minutes or until liquid is absorbed. Remove from heat, keep covered, and let stand for 10-15 minutes. Fluff the rice and divide it onto plates.
SAUCE: Pour the reserved 3/4 cup marinade into a small pot over high heat. Bring to a boil and boil for 1-2 minutes or until sauce is slightly reduced and thickened. Remove from heat and spoon over grilled chicken.
SERVE: Top sauced chicken breasts with fresh cilantro, a squeeze of fresh lime, and finely chopped cashews if desired. Enjoy immediately.