St. Louis-style ribs are seasoned with a dry rub and cooked low and slow on the smoker until they are tender and juicy, then slathered in a homemade BBQ sauce.
Dry Rub: In a bowl, combine all dry rub ingredients thoroughly. Set aside.
BBQ Sauce: In a saucepan, mix together all sauce ingredients. Stir to combine. Simmer over low heat for 5-10 minutes. Set aside.
Smoker Setup: Preheat smoker to 250°F. If using a grill, set it up for indirect cooking and heat to 250°F. Add smoker wood splits, chips, or pellets when the temperature reaches 250°F.
Preparing the Ribs: Remove the membrane from the spare ribs. Coat both sides of the ribs with yellow mustard.
Season ribs generously with the prepared dry rub, ensuring spices are patted into the meat for better adhesion.
Smoking: Place ribs on the smoker and cook for 2 hours or until they achieve a deep mahogany color.
Spritz ribs with the spritz mixture every 30 to 40 minutes to prevent drying.
Remove ribs from the smoker and spritz before wrapping them in butcher paper.
Return wrapped ribs to the smoker and cook until the internal temperature reaches 205°F, approximately 1 to 1 ½ hours.
Once cooked, remove ribs from the smoker and lightly brush on BBQ sauce.
Let ribs rest for 10 to 15 minutes before serving.