Do I need to remove the membrane?
It is highly recommended. The membrane (silver skin) on the bone side can turn chewy and blocks seasoning. Slide a butter knife under it, grip with a paper towel, and peel it off in one satisfying sheet.
Baby back, spare, or St. Louis style?
All work, just adjust expectations and time. Baby back ribs are leaner and often finish faster. Spare ribs (and St. Louis style, which are trimmed spares) have more fat and usually need longer to get truly tender. Use the timing as a starting point, then cook until tender, not until the clock says so.
How do I know when the ribs are done?
Think tenderness tests, not math. After the foil bake, a toothpick or skewer should slide into the meat between bones with very little resistance. The rack should bend easily and the surface may crack slightly when lifted with tongs. “Pulled back from the bone” can happen before the ribs are actually tender, so treat it as a clue, not a verdict. If you use a thermometer, aim around 195 to 203°F in the thickest meat away from the bone (bones can throw off the reading).
Can I make these without barbecue sauce?
Yes. Skip the sauce and finish the ribs uncovered at 425°F for 8 to 12 minutes to deepen the bark. Serve with a bright finishing sauce like vinegar sauce, chimichurri, or lemony yogurt.
My sauce burned. What happened?
Most sauces have sugar, which can go from caramelized to scorched fast. Keep the ribs on the middle rack and watch closely during the high-heat finish. You can also brush on sauce in two thin coats during the last 10 minutes, or bake at 400°F for a few minutes first, then broil only 1 to 3 minutes at the end for color.
Can I prep these ahead?
Absolutely. Rub the ribs and refrigerate (covered) for up to 24 hours. Bake the next day. This is peak “I planned but not like a superhero” energy.
Will 1 tablespoon of kosher salt make these too salty?
It depends on the brand. Diamond Crystal is lighter by volume than Morton. If you use Morton kosher salt, consider reducing to about 2 to 2 1/4 teaspoons. When in doubt, go a little lighter, because sauce and any saved juices can add salt too.