Peel and finely dice or chop the onion and garlic. Mix the spice mixture, salt, pepper, curry, paprika and sugar in a bowl.
Heat oil in a pot. Add onion cubes and fry lightly. Add the garlic and fry briefly. Add the tomatoes, vinegar, Worcestershire sauce and spices and bring to the boil briefly.
Stir in the cola and bring to the boil briefly. Set the stove to half heat. Add the whiskey and sugar beet syrup. Let simmer for about 30 minutes.