In a large frying pan over medium heat, add butter. Once melted add onion and Worcestershire sauce. Stir to coat and reduce heat to medium low. Continue to simmer and stir while making the rest of the burger.
In a bowl, combine ground beef, salt, pepper, dill, paprika and blue cheese crumbles. Once thoroughly combined, form into 12 1½-inch balls.
In a separate large saute pan, add bacon. Cook until crispy and remove to a paper towel covered plate.
In the same pan, cook the patties in stages. Place each ball in pan and use a flat spatula to flatten as much as you are able to (roughly ¼-inch thick). Remove from pan, and continue with remaining patties.
Build the burger, starting with bottom bun then a piece of lettuce. Place two patties on lettuce, top with 2-3 pieces of bacon and a portion of caramelized onions. Next drizzle blue cheese dressing over and then add top bun.