In a large skillet, sauté the onion, garlic and celery or celery root in water for 5 to 10 minutes until celery root is soft and onions translucent.
Add potatoes, spices and lemon juice. Cover and cook for 8 to 10 minutes, stirring occasionally. Add more water if needed to prevent sticking and cook a bit longer if necessary to make sure potatoes are starting to get soft.
Add remaining ingredients. Cover and let stew over medium heat for about 30 minutes, stirring occasionally.