Beer isn’t just for drinking. Here, it’s drizzled on top of the ribs to help the meat break down as it cooks low and slow in an oven. It’s also the star ingredient in the barbecue sauce that glazes these super tender ribs that are finished off on a grill for a slightly smoky flavor.
Combine the light brown sugar, smoked paprika, celery salt, garlic powder, onion powder, allspice, 2 tablespoons salt and a generous amount of pepper in a small bowl. Rub the mixture on both sides of the rib racks.
Wrap each rib rack in 3 pieces of aluminum foil and refrigerate for 6 hours and up to overnight.
Preheat the oven to 300 degrees F. Place the ribs side-by-side on a baking sheet. Unwrap the foil slightly, pour 2 tablespoons beer over each rib rack and then seal the foil tightly. Bake until the ribs are tender, and the meat can easily be pierced and pulled away with a fork, about 2 hours 30 minutes. Let cool, uncovered, until warm, about 20 minutes. Alternatively, cover and refrigerate for up to 1 day.
Put the shallots and remaining beer in a small saucepan and bring to a boil over high heat. Boil until the beer reduces to 1/4 cup, about 10 minutes. Whisk in the ketchup, molasses, whole-grain mustard, chipotle in adobo sauce, chopped chipotle and sherry vinegar. Reduce the heat to medium-low and let simmer, stirring occasionally, until the sauce thickens slightly and reduces to about 1 1/4 cups, 8 to 10 minutes.
Prepare a grill or large grill pan for medium-high heat. Clean and oil the grill grates.
Brush the top of each rack of ribs with 1/4 cup of the barbecue sauce. Working in batches as needed, grill, sauce-side down, until browned and slightly charred, about 4 minutes. Cut the ribs between the bones, slather with the remaining 1 cup of sauce and serve.