In a large skillet over medium-high heat, season with sea salt and black pepper. Stir fry, breaking up the pieces with a spatula, for about 7-10 minutes, until the beef is browned and moisture has evaporated.
Meanwhile, whisk together all dressing ingredients. Set aside.
Divide the leave lettuce among 4 bowls. Top with tomatoes, onions, and cheddar.
When the beef is cooked, add it to the bowls, along with fanned avocado slices.
Drizzle burger bowls with burger sauce.