Cut the chicken into bite-size pieces and rinse well.
Cut the potatoes, carrots, and onions into large chunks.
Heat oil in a pan and sauté the chicken over medium heat.
Add soy sauce, sugar, minced garlic, and black pepper to the chicken.
Add the prepared vegetables and stir-fry together.
Pour in 200ml of water and bring to a boil.
When it starts boiling, skim off any foam, cover with a lid, and simmer over medium heat for 20 minutes.
Once the sauce thickens, turn off the heat and finish.