In a medium skillet, heat sesame oil. Add remaining 2 tablespoons grated ginger, garlic, and carrots. When mixture begins to brown, add prawns and sauté 30 seconds. Add chopped pepper, 1/2 cup tamarind juice, and 2 ounces ginger juice and bring to simmer over high heat. Stir in oyster sauce, salt, and pepper, and allow sauce to reduce a bit.