3 chicken burgers caramelized Recipes

olive oil, divided, shallots, sliced, ground chicken, garlic clove, minced, chopped fresh rosemary, kosher salt, freshly ground black pepper, romaine lettuce leaves, kaiser rolls, split and toasted, mayonnaise, crumbled blue cheese

extra large sweet onions, chicken broth or 1 (10 1/2 oz) can beef broth, undiluted, butter, ground beef, salt, white pepper, fresh ground black pepper, ground red pepper, paprika, caramelized onion, white balsamic vinegar, lettuce leaf, roll