Preheat oven to 250 degrees Fahrenheit (130 degrees Celsius). Heat a large skillet over medium-high heat and add two tablespoons canola oil.

Wash and dry ribs. Sprinkle with salt and pepper. Place a few ribs at a time into the skillet and brown for five minutes on the top and bottom and three minutes on each side. When nice and browned, transfer to a 9×13-inch baking pan.

In a small cup, combine chili powder, paprika, brown sugar, and onion powder. Sprinkle generously over the ribs. (Store leftover spices in a resealable plastic bag or small container for later use.)

Cover pan with foil, seal well, and place in oven while you prepare your rib sauce.

Place grape juice in the same skillet. Bring to a boil over high heat and boil until reduced by half, around 10 minutes.

Stir in remaining ingredients. Once mixture reboils, lower to a simmer. Cook until slightly thickened, about five minutes.

Remove ribs from oven and pour the sauce over ribs. Turn ribs over, ensuring all are well coated. Double-wrap the pan with foil and seal well.

Return to oven and bake for another two hours.

Remove from oven, turn ribs over, and baste well. Recover. Increase heat to 325 degrees Fahrenheit (170 degrees Celsius) and bake an additional hour.

Baste once more and test for readiness. Ribs are ready when they begin to pull away from the bone and are fork-tender. Total cooking time is three to four hours.