Place Pork, salt, pepper, garlic, rosemary, oregano, onions, tomato paste, red wine, broth, mustard and tomatoes in a large Freezer Ziploc bag.
Place Kale and Red Wine Vinegar in another Gallon Zip Lock bag. Place sealed bag with the pork inside the bag with the Kale.
Remove as much air as possible, seal and lay flat in the Freezer.
Cooking
The night before cooking, move frozen bag to your refrigerator to thaw.
The morning of cooking, pour contents into slow cooker. (not including the kale with vinegar)
Cook on “low” setting for 8 hours. Shred pork and return it to the slow cooker with the kale and vinegar mixture. Cover and cook on High for 5 minutes until the Kale is tender.
Cook polenta per the directions on the box, stirring with a whisk. Serve ragù over polenta.