8 slices thick-sliced bacon
1 1/4 pounds Ground buffalo (bison)
  Salt and freshly ground black pepper
3 tablespoons olive oil
1 large yellow onion (cut in half through the stem end, then thinly sliced crosswise)
4 slices Swiss cheese
4 Good-quality rolls or burger buns (split)
1/2 cup Barbecue sauce (warmed)
2 cups Sauerkraut (drained and heated until warm)
2 ripe tomatoes (cut into thick rounds)
  Earthbound Farm Organic Butter Lettuce Leaves
  Sliced dill pickles
  Dijon mustard