Cooking Slab Of Ribs In Oven. Trim the rack of spare ribs from any excess fat pat them dry with a paper towel. Preheat your oven to 275-300 F depending on how strong your oven is and line an appropriately sized baking sheet with aluminum foil for easy clean up then place a sheet of parchment paper on top.
Bake in preheated oven until tender 2 12 to 3 hours. Spray cooking rack liberally with cooking spray. Bake ribs for 8 hours without opening door.
Place the parcel of meat in the oven to cook for approximately 30 minutes.
Place the parcel of meat in the oven to cook for approximately 30 minutes. Spray cooking rack liberally with cooking spray. Let the ribs rest in the pan covered with foil for 5-10 minutes before serving. Know that cooking time will vary depending on the cut and quantity of meat so keep a close eye on your parcel spare ribs will need more time than back-cut ribs for example because they have more fat.