Season the minced beef with salt and pepper and shape into 4 equal patties, about 1 cm thick.
Cut the rolls open and toast them in a toaster on both sides until lightly golden (about 1-2 mins total). Set aside.
Cut the iceberg lettuce into thin strips and slice the tomatoes into even slices. Set aside.
Cut the onions into rings. Heat the lard in a pan over medium heat and cook the onions for 10-12 mins, stirring occasionally, until golden brown and caramelized.
In a separate pan, fry the bacon over medium-high heat for 5-7 mins until crispy. Set aside.
In another pan, fry the beef patties over medium-high heat for 3-4 mins per side, until the internal temperature reaches 71°C (160°F). During the last 1 min of cooking, place a cheese slice on top of each patty to melt.
In a small saucepan, heat the BBQ sauce over medium heat for 2-3 mins, stirring occasionally.
Spread the mayonnaise on both halves of each toasted roll. On the bottom halves, layer the lettuce strips and tomato slices. Season lightly with salt and pepper.
Dip the cooked beef patties in the warm BBQ sauce to coat all sides, then place them on top of the tomato layer on the bottom roll halves.
Top each burger with the caramelized onions and bacon, then cover with the top roll half. Serve immediately.
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