Cauliflower Chicken Fried Rice

Name: Cauliflower Chicken Fried Rice
Ingredients: 0.75 pound skinless, boneless chicken breasts, cut into small cubes; 6 tablespoons soy sauce, divided; 1 tablespoon brown sugar; 2 teaspoons sesame oil, divided; 1 teaspoon cornstarch; 3 tablespoons vegetable oil; 5 scallions, chopped, light and dark green parts separated; 4 garlic cloves, minced; 1 (1 1/2 inch) piece fresh ginger, grated; 2 pounds cauliflower rice; 1 teaspoon kosher salt, divided; 1.5 cups frozen peas and carrots; 2 eggs, beaten; 0.5 cup finely diced fresh pineapple; 0.25 cup chopped peanuts; 1 tablespoon rice vinegar