Insanity Burger From 'Jamie Oliver's Comfort Food'

Name: Insanity Burger From 'Jamie Oliver's Comfort Food'
Cuisine: American
Ingredients: 1 3/4 lbs ground chuck steak; Olive oil; 1 large red onion; 1 splash of white wine vinegar; 2 large gherkins; 4 sesame-topped brioche burger buns; 4–8 slices of smoked bacon; 4 teaspoons yellow mustard; Tabasco Chipotle sauce; 4 thin slices of Red Leicester cheese; 4 teaspoons tomato ketchup; 1/4 of an iceberg lettuce; 2 heaping tablespoons mayo; 1 heaping tablespoon tomato ketchup; 1 teaspoon Tabasco Chipotle sauce; 1 teaspoon Worcestershire sauce; Optional 1 teaspoon brandy or bourbon