Cut pork in half lengthwise and cut into ¼ inch thick slices. Set aside. In a large, nonstick skillet or wok, heat oil over medium-high heat. Add garlic and stir-fry for 2 minutes, or until browned. Add curry paste and cook for 30 seconds, pressing it against the sides and bottom of the skillet or wok. Add pork and stir-fry for 2 to 3 minutes, or until light brown. Add stock and bring to a boil. Add eggplant, beans, fish sauce, krachai and lime leaves or zest, and cook for 5 to 6 minutes, or until the vegetables are tender. If using lime leaves, discard them. Remove from heat and stir in basil. Serve with sticky rice.