Prime Rib Rub Ingredients. As mentioned there are just 6 dry ingredients in this prime rib seasoning mix: kosher salt, dried thyme, dried rosemary, black pepper, onion powder and garlic powder. Seems simple, but there’s a reason it’s a self-deemed classic of Foodie and Wine. If you love the Traeger Prime Rib Rub, you’ll love ours.
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