1. Mix the coriander, honey, onion, cider, and vinegar in a large bowl (not a metal one). Add the quails and marinate overnight.
2. Preheat the oven to 350 degrees. Drain and reserve the marinade. Dry the quails with paper towels. Heat the butter and oil in a large casserole. Add the quails, 4 at a time, seasoning them with salt and black pepper. Brown on both sides.
3. Put all the birds in the casserole and pour the marinade over them. Cover and cook in the oven for 40-45 minutes, basting occasionally, or until tender. Garnish with chopped parsley to serve.