1/4 cup homemade turkey broth or low-salt chicken broth
4 soft sandwich buns, halved, toasted
Directions
Combine first 3 ingredients in medium bowl. Let stand at room temperature until onion softens, tossing occasionally, about 2 hours; or cover and chill up to 1 day.
Combine turkey, barbecue sauce, and broth in medium nonstick skillet. Bring to simmer over medium heat. Reduce heat to low; simmer until heated through, stirring often, about 5 minutes.
Arrange bottoms of buns on plates. Spoon turkey mixture onto buns. Using tongs, pile pickled-onion mixture atop turkey. Cover with top halves of buns.