Step 1Arrange ribs in single layer, rounded side up, in shallow roasting pan. Roast on lower rack at 350 degrees 30 minutes, then season ribs on both sides with salt and pepper. Continue roasting until browned and crisp as desired, 30 to 40 minutes.
Step 1Rinse sauerkraut well in colander under cold running water, tossing it with your hands until completely rinsed.
Step 2Place sauerkraut, broth, brown sugar, barbecue sauce, 2 teaspoons chipotle puree, juniper berries and salt to taste in large nonstick skillet; mix well. Bring to boil, uncovered, then reduce heat and simmer until most of liquid is evaporated, about 30 minutes. Taste and adjust chipotle. (Can be made ahead and reheated, adding water if mixture is too dry.) Serve hot, topped with spareribs.