Season the short ribs with salt and crushed black peppercorns. Coat evenly.
In a hot skillet, sear the short ribs on all sides using vegetable oil. This should take about 8 minutes.
In a large bowl, combine celery, carrots, leek, and garlic. Place these seasoned ribs into the bowl.
Pour the Cabernet Sauvignon over the short ribs and vegetables. Marinate in the refrigerator for at least 6 hours.
Remove marinated ribs and preheat your oven to 325°F (163°C). Transfer contents to a baking dish, ensuring ribs are covered with the marinade.
Serve five to six people. Prep takes about 20 minutes, while cooking and marinating require about 6 hours.