1/4 cup rice wine vinegar
1 tablespoon prepared wasabi
1 cup shredded white cabbage
1/2 cup quartered and thin sliced red onion
1 avocado
1 tablespoon sambal or other Asian chili paste
1 cup diced tomatoes
1/4 cup fresh cilantro leaves
Salt
1 1/4 pounds pulled bison meat (braised flank steak)
1 cup beef or chicken stock
Eight 6-inch tortillas