Peel and finely cube the onion and garlic.
1 onion, 1 clove garlic
In a pan heat up the olive oil and then fry the onions and garlic until the onions become translucent. Now add in the brown sugar and stir until the sugar crystals dissolve and the onions start to caramelize.
1 tablespoon olive oil, 50 g brown sugar
Add in the tomato paste and fry for a minute longer.
2 tablespoon tomato paste
Pour in the cider vinegar followed by the tinned tomatoes. Bring to a simmer and boil until it reduces by a ⅓. Season with the worchester sauce, curry powder, and cayenne pepper.
1 tin chopped tomatoes, 1 teaspoon cider vinegar, 1 teaspoon Worcestershire Sauce, 2 teaspoon mild curry powder, 1 teaspoon cayenne pepper
With an immersion stick, you can puree the tomatoes sauce until smooth. Season with salt and pepper to taste.