Trimming a full, “prehistoric” rack of spare ribs into a neat St. Louis cut is one of the first professional skills every pitmaster should learn. There’s a real satisfaction in turning a large, irregular slab into a clean rectangle. Beyond presentation, a squared rack cooks more evenly on your Big Green Egg, giving consistent results across every bone.
Before we grab the knife, let’s clarify what spare ribs are. Spare ribs come from the pig’s belly and are longer than baby back ribs. They share the same region as bacon, so the meat carries good marbling and flavorful fat. While the meat layer over the bones may be thinner than on baby backs, the rendered fat adds depth and richness that many barbecue purists prefer.
A St. Louis style spare rib is simply a full rack that’s been trimmed to remove the breastbone and excess cartilage, producing a uniform rectangle. That tidy shape is the standard in KCBS competition pits. Learning to find the natural break and trim confidently improves both presentation and cook consistency. So relax with a cold beverage and let’s walk through How to Trim St. Louis Style Spare Ribs.
