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Plus, properly cooked pork ribs are great for a backyard BBQ, especially when served with fun sides like this French-inspired potato salad or this Vietnamese grilled corn. Once you make the trip to the store, though, what kinds of ribs should you buy? To understand better, baby back ribs are cut from around the loin, while spareribs come from the belly area.
Let’s take a look at the two most commonly sold types of ribs: baby back ribs and St. Louis-style spareribs.
Back ribs are cut from where the rib meets the spine after the loin is removed. The upper ribs are called baby back ribs because they are shorter in relation to the bigger spareribs — not because they come from a baby pig. Baby back ribs are also sometimes called pork loin back ribs, back ribs, or loin ribs.
Each baby back rib rack averages 10 to 13 curved ribs that are 3 to 6 inches long and weigh about 1 1/2 to 2 pounds, which feeds about 2 people. Baby back ribs are very tender and lean, but are in higher demand than St. Louis-style spareribs, so they have a higher price tag.
Spareribs are the meaty ribs cut from the belly of the animal after the belly is removed. They are usually trimmed down into the popular St. Louis-style spareribs by cutting away the hard breastbone and chewy cartilage, so the slab is more rectangular in shape. Spareribs are also sometimes just called St. Louis-style spareribs or breastbone-off pork spareribs.
St. Louis-style spareribs are flatter than baby back ribs, which makes them easier to brown. There is a lot of bone but also a higher amount of fat than baby back ribs, making them very flavorful if cooked properly. Each slab usually weighs 2 1/2 pounds or more and feeds about three to four people. St. Louis-style spareribs are typically cheaper than baby backs ribs.
Can You Substitute One Type of Rib for the Other?
Yes, you can substitute baby back ribs for St. Louis-style spareribs, but since they are smaller, you will need about 1 1/2 times the amount of baby backs as St. Louis-style ribs. Since St. Louis-style ribs are larger, they take longer to cook, so note that baby back ribs take about 1 1/2 to 2 hours to cook at 300°F, but St. Louis ribs will take 2 1/2 to 3 hours.