Eat these over-the-top burgers with a knife and fork, or set out a pile of napkins. Add fresh crisp texture and flavor by mounding slaw atop the burgers. Serve extra slaw on the side, or save it for another day.
Preheat grill to 350° to 400° (medium-high) heat. Whisk together mayonnaise, sour cream, apple cider vinegar, 1/2 tsp. salt, and 1/4 tsp. pepper in a large bowl. Add coleslaw mix; toss to coat. Cover and chill until ready to serve.
Combine ground sirloin, steak sauce, and remaining 1 tsp. salt and 1/2 tsp. pepper. Gently shape mixture into 4 (4-inch) patties.
Grill patties, covered with grill lid, 4 to 5 minutes on each side or until beef is no longer pink in center. Serve on hamburger buns, and top burgers with chili and coleslaw mixture.
Note: We tested with Fresh Express 3-Color Deli Cole Slaw.