Preheat grill pan in 400° degree oven until very hot. If using the stove-top method, heat cast iron of heavy skillet over medium-high heat.
Sprinkle steak generously with salt and pepper on both sides.
Add steaks to hot pan, and sear each side until steaks are cooked to medium-well, about 6 minutes per side. Cook less or more time to doneness preference.
Remove steaks to plate and set aside to rest.
In medium-sized bowl combine garlic, buttermilk, mayonnaise, sour cream, lime juice, lemon juice, dried dill, onion powder, a pinch of salt and pepper, worchestershire sauce, and pepper sauce. Stir until completely combined and smooth.
Equally divide greens onto four plates. Next equally divide and arrange remaining vegetables on the plates.
Cut steaks into 1" inch cubes and equally divide onto plates.
Lightly drizzle each plate with dressing, and serve. Reserve remaining dressing in bowl and place on table.