Sauté the onion, garlic and chilli in olive oil/butter. Add the ketchup, honey, sugar, tomato puree, Worcestershire sauce and soy sauce, mix well. Bring the sauce to the boil, reduce the heat and simmer for approx. 20 mins. Stir in the whisky.
Mix the mince with the cream, season. Using your hands, shape the mixture into four balls and flatten into burgers. Heat the oil in a frying pan, fry the burgers on both sides until crispy.
In a frying pan, gently fry the bacon until crispy, remove. Fry the onions in the bacon fat until crispy. Top the bottom half of each bun with the sauce, onions, tomatoes, lettuce, meat, cheddar and bacon, cover with the top half of the bun.