Inside a mixing bowl, mix together the Onion (1), Light Soy Sauce (1/2 cup), Honey (1/2 cup), Fresh Ginger (2 teaspoon), Rice Vinegar (1/4 cup), Garlic (2 clove), and Freshly Ground Black Pepper (to taste).
Cut the Boneless, Skinless Chicken Thigh (1 kilogram) into pieces and place them on the bottom of a slow cooker. Pour the marinade over the chicken, turn on the slow cooker to high and cook the entire mixture for about 4 hours.
After 4 hours, mix together the Corn Flour (2 tablespoon) and Water (1/2 cup), and pour the mixture into the pot. Also add and stir through the Broccoli (1 head), Zucchini (1), and Carrot (1). Put the lid on and cook the mixture for additional 30 minutes.