Burger bunMix the warm water, milk, sugar and yeast together, and leave to stand for 5 minutes. Add the flour, salt, egg and melted butter. Briefly knead the dough until smooth, and leave covered for 1 hour in a warm place. Roll out approx. 90-g pieces of dough, lay on a baking tray lined with baking paper, and press flat. Leave to stand for another 30 minutes. Whisk the water, milk and egg mixture, use it to coat the dough pieces, then sprinkle with sesame seeds. Bake the dough pieces in a pre-heated (200°C top/bottom heat) oven until golden brown.
BBQ SauceSteam the onions and garlic in rapeseed oil. Add the ketchup, spices and vinegar. Lightly toast the brown sugar, and deglaze with the bourbon whiskey. Leave to simmer on a medium heat for approx. 30 minutes, and stir until the desired consistency is achieved.
Burger & fillingsCut up the red onions, lettuce, tomatoes and gherkins, and leave to one side. Grate the cheese. Form approx. 30-cm-high patties out of the beef mince. Cook the patties on a medium-high heat. When the sides turn brown, flip the patties over and sprinkle the cheese on top. Remove the patties from the heat and briefly leave to stand. Briefly toast the burger buns in the pan, and spread with the BBQ sauce. Assemble the burger.