135g - Onions, finely
40g - Unsalted butter
20g - Garlic, finely minced
80g - Distilled vinegar
80g - Water
50g - Ketchup
40g - Ancho chili paste
6g - Worcestershire sauce
2g - Chili powder
2g - Mustard powder
0.5g - Cayenne pepper
13.5g - lemon juice
2g - Sugar
Salt to taste

Sweat the onions and garlic in the butter. Add all of the other ingredients apart from the lemon juice, sugar and salt. Simmer for 20 mins then season with lemon juice, sugar and salt then refrigerate