Wash the chickens. (If they are whole, cut into serving pcs.). Season lightly with salt & pepper, and set them aside to drain. Wash the okra. Remove the stems carefully, without cutting the okra. Line them up in a large flat pan and sprinkle with the vinegar; place in the sun for 30 min to 1 hour. Brown the butter in a pot, add the chicken, and saute until brown, then add the onion and let it brown. Add the tomatoes and boil for 3 to 5 min. Add water. Simmer for 30 min. Add okra and continue to simmer, covered, until tender. Watch carefully as this may need a little more water. The okra will have absorbed the liquid and only the oil should remain when the dish is cooked.