Preheat your grill over high heat. Drizzle onion slices with olive oil and a sprinkle of salt.
Once hot, add BUBBA burgers to one side of the grill followed by the onions. Add the bacon to the back of the grill to avoid high heat.
Grill everything for 5 minutes, then flip the burgers and the onions. The bacon takes a few minutes longer, so just flip that once the bottom side is crispy and browning.
Once the burgers are flipped, equally add the blue cheese crumbles to each burger and close the lid. Let the cheese melt for 5 minutes. Once the burgers are cooked through and the cheese has melted, remove them from the heat and set aside.
As the burgers are just about done cooking, add the buns to the grill, interior side down, and toast until golden brown.
To assemble the sandwiches, add 1 tablespoon of blue cheese dressing to the bottom buns, followed by 2 pieces of bacon (broken to fit on the sandwich).
Then add the blue cheese BUBBA burger followed by the whole grilled onion. Add ⅓ of the arugula to each sandwich followed by a drizzle of lemon juice and balsamic glaze.
Smear the remaining blue cheese dressing on the top half of the bun then close the sandwich up. Enjoy!