How to turn the dregs of a ketchup bottle into a classic Marie Rose dressing – recipe | Waste not

Shake up the remnants of a bottle of ketchup with a splash of sprits, a heap of mayonnaise and a few other simple additions, and turn it into one of the culinary world’s most famous sauces My new favourite preparation for sauces, marinades and dressings is in a near-empty jar, tub or bottle, so I can upcycle all the remains. Rather than washing it and putting it in the recycling, I instead add a…