Small onion - 1, peeled, finely chopped
Stock or water - 150 milliliter / 1/4 pint
Tomato ketchup - 150 milliliter / 1/4 pint
Capers - 1 x 15 milliliter spoon / 1 tablespoon
Gherkins - 1 x 15 milliliter spoon / 1 tablespoon, chopped
Salt - to taste
Freshly ground black pepper - to taste
1. In a pan, melt the butter, put in the onion and fry gently until soft.
2. Stir in ketchup, add in stock, capers, gherkins, salt and pepper. Bring to the boil and simmer for 10 to 15 minutes or until thick, stirring constantly.
3. TO STORE BY FREEZING: Pour into a rigid container. Seal the container, label it and freeze.
4. TO USE A FROZEN SAUCE: Thaw at room temperature for 4 hours, then beat until smooth before serving.