Rub the country style ribs with the spice blend or rib rub, or if not using, sprinkle with salt and pepper.
In slow cooker or the Instant Pot slow cooker, whisk together ketchup, sugar, vinegar, mustard powder, cayenne, 1 teaspoon salt, and 1/2 teaspoon pepper.
Add ribs to slow cooker, and toss with sauce. Arrange ribs, bone side up, in a single row. Cover; cook on high in the slow cooker for about 6 hours or in the Instant Pot on high for about 6 1/2. If using a low setting, cook for 10 hours.
Serve ribs drizzled with pan juice. Defat if desired. If sauce seems too thin it may be reduced in the Instant Pot on Saute function or on the Stovetop.
Note: If you prefer to cook in the oven, preheat oven to 350 degrees. Use a 5-quart Dutch oven or ovenproof pot with a tight-fitting lid and proceed with the recipe, adding 1 cup water. Cover; bake until ribs are tender, 2 1/2 to 3 hours.
Keywords: Bargain Meal of the Week, country style ribs, German, Instant Pot, ketchup, Pork, rib rub, Slow Cooker, Vinegar