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Braise the Ribs. Cover the Dutch oven tightly and transfer it to the preheated oven. Bake about 2 hours or until the ribs are very tender, adding 2 cups frozen small whole onions to the pan during the last 30 minutes of baking.
1 Place the ribs in the oven. 2  Cook ribs for 2-1/2 to 4 hours. 3  After about 2-1/2 hours, open a corner of one of your foil packets and test the ribs with a fork. 4  If they are tender, move on to step 5.5  Otherwise, allow them to continue to cook until they are fork tender.tep-by-Step Guide for Cooking Pork Ribs in an Oven. The best thing about pork ribs cooked in the oven is that, after minimal prep, you can put them in the oven and walk away for several hours. It doesn't get any better than that. Learning how to cook pork ribs in the oven is really easy.