1. Heat a non-stick pan and sear the chicken drumsticks until brown. Remove from pan and set aside.
2. Add olive oil and sauté celery, carrot, onion for few minutes, then add the garlic, followed by dried oregano, paprika, tomatoes, tomato paste, bay leaf and chicken stock. Bring to simmer and put the chicken drumsticks back in. Reduce heat to low and simmer for about 30 minutes, stirring occasionally.
3. When the cooking liquid has reduced to a stew consistency, add green beans, remove the bay leaf, and cook for further 5 minutes. Season to taste with salt and pepper. And as an optional step thicken with some tapioca starch mixed with water. Serve warm as it is, or with bread (rice is good too, if you swing that way).