Prepare the Beef Patties: In a large mixing bowl, combine the beef mince with the finely diced red onion, Worcestershire sauce, English mustard, garlic powder, smoked paprika, salt, and black pepper. Mix gently but thoroughly with your hands until just combined – avoid overmixing, as this can make the burgers tough. The mixture should feel slightly sticky and uniform in colour.

Form the Sliders: Divide the seasoned beef mixture into 12 equal portions. Roll each portion into a small ball, then gently flatten into a disc, about 1cm thick and slightly wider than your slider buns, as they will shrink during cooking. You want them to be neat, compact patties, ready for the grill.

Cook the Beef Rashers: Heat 1 tablespoon of olive oil in a large frying pan or skillet over medium-high heat. Add the beef rashers in a single layer, ensuring not to overcrowd the pan. Cook for 2-3 minutes per side, until they turn wonderfully crisp and golden-brown, releasing a rich, smoky aroma. Once done, remove them from the pan and place them on a plate lined with kitchen paper to drain any excess fat.

Grill the Patties: Preheat your grill or grill pan to a medium-high heat. Lightly brush the grill grates with the remaining olive oil. Place the beef patties onto the hot grill. Cook for 3-4 minutes per side for medium-rare, or 5-6 minutes per side for well-done. You'll hear a satisfying sizzle, and the patties will develop a lovely char and grill marks, transitioning from a raw pink to a rich brown, with internal juices running clear when pressed. An internal temperature of 71°C (160°F) ensures they are cooked through.

Assemble and Melt the Cheese: During the last minute of cooking the patties, place a slice of Cheddar cheese on top of each one. Close the grill lid or tent the pan with foil for about 30-60 seconds, allowing the cheese to melt and become gloriously gooey and shiny, cascading slightly over the sides of the patties. Meanwhile, lightly toast the slider buns on the grill or under a grill for 1-2 minutes until they are lightly golden and fragrant.

Finish and Serve: Spread a generous dollop of BBQ sauce on the bottom half of each toasted bun. Place a cheesy patty on top, then add a few crispy beef rashers, a fresh baby gem lettuce leaf, a slice of tomato, and a gherkin. Top with the other half of the bun. Arrange the BBQ Bacon Cheeseburger Sliders on a platter and serve immediately, allowing everyone to enjoy the incredible combination of textures and aromas.