After several attempts to cook the pre-rubbed St. Louis ribs from Costco, I think we finally figured out the magic cooking combination to get moist and not-too-charred BBQ ribs.
1 pkg Costco St. Louis ribs
Sweet Baby Ray’s BBQ sauce
Preheat oven to 325˚F. Wrap each slab of ribs in heavy-duty foil and seal. Place both packets on large cookie sheet or baking dish. Place in oven on center rack and bake for 3 hours.
Preheat grill to medium. Remove ribs from foil and place on grill meat side up. Baste top with BBQ sauce and grill for 5 min. Flip, baste again and grill for about 5 min. until nice grill marks appear. Flip and grill for 2-3 min. just to caramelize sauce on bottom.