In a small bowl, stir together all ingredients for the blue cheese sauce. Refrigerate.
Divide ground beef into 16 even portions and form into mini burger patties the size of the slider rolls. Sprinkle with salt and pepper. Grill about 1-2 minutes per side or until cooked thoroughly. Rest 5 minutes then assemble sliders.
To assemble, place lettuce on the bottom of the slider roll. Top with burger, strawberry slices, diced onion and blue cheese sauce. Top with other half of roll and repeat with the rest. Serve immediately.
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