Slice pork in cubes. Marinate the pork with lemon juice, soy sauce, Worcestershire sauce, garlic powder and black pepper for 2-3 hours.
Heat up oil in a pan. Sauté garlic and onions. Add the marinated pork cubes. Stir, cover, and let it cook until pork cubes are tender. Stir occasionally.
Add potatoes and carrots. Stir then add tomato paste and water. Add soy sauce and black pepper. Stir everything together, cover, and let it simmer to cook until potatoes and carrots are soft and tender.
Sprinkle sugar then add the cubed celery and sweet peppers. Stir and cook for another 5-8 minutes. The remaining heat will cook the celery and sweet peppers.