Instructions

• In a medium bowl mix the blue cheese, mayonnaise, vinegar, and ½ teaspoon pepper to make a dressing. Add the coleslaw blend and toss in the dressing. Cover and refrigerate until ready to use.
• In a large skillet over medium heat, fry the bacon until crisp, about 10 minutes, turning occasionally. Drain the bacon on a plate lined with a paper towel.
• Prepare the grill for direct cooking over medium-high heat (200º to 260ºC).
• Mix the ground chuck, salt, and ¾ teaspoon pepper. Gently form four patties of equal size, each about 18 millimeters thick. With your thumb or the back of a spoon, make a shallow indentation about 2.5 centimeters wide in the center of each patty to prevent them from doming as they cook. Refrigerate the patties until ready to grill.
• Brush the cooking grates clean. Grill the patties over direct medium-high heat, with the lid closed, until cooked to medium doneness, 9 to 11 minutes, turning once. During the last 30 seconds to 1 minute of grilling time, place a slice of cheddar cheese on each patty to melt, and toast the buns, cut side down, over direct heat. 
  Brush the cooking grates clean. Grill the patties over medium-high heat, with the lid closed, until cooked to medium doneness, 9 to 11 minutes, turning once. During the last 30 seconds to 1 minute of grilling time, place a slice of cheddar cheese on each patty to melt, and toast the buns, cut side down, over direct heat. 
• Build each burger on a bun with a patty, a strip of bacon (torn in half), an onion slice, and the coleslaw. Serve warm.