How to Make It
Preheat oven to 375°F. Place bacon in a large nonstick skillet over medium-high. Cook until crisp, turning occasionally. Transfer bacon to paper towels to drain; chop and set aside. Reserve 1 teaspoon of drippings in skillet.
Add onion to drippings in skillet over medium-high, and cook, stirring often, until translucent, about 3 minutes. Add ground sirloin; cook, stirring to crumble, until evenly browned, about 7 minutes. Drain and return to skillet. Stir in cream cheese, Worcestershire, and pepper until cheese is melted and ingredients are combined.
Reserve 2 tablespoons of chopped bacon for garnish. Add Cheddar cheese and remaining bacon to beef mixture, and stir to combine. Pour mixture into a lightly greased 2-quart baking dish. Bake in preheated oven until golden and bubbly, about 20 minutes.
Stir together ketchup and mustard in a small bowl; spread mixture evenly over baked dip. Sprinkle with lettuce, tomato, pickle, and reserved bacon. Serve with crackers.