Got leftover red onion from making gravy? Add mushrooms for a great relish in a sausage sandwich. (No picture – it looks gruesome despite being very tasty).

Red onion and mushroom relish:

1 teaspoon sugar

2 red onions, finely sliced

¼ teaspoon baking powder

100ml beef stock

6 chestnut mushrooms, finely sliced

1 sprig thyme, leaves picked

1 teaspoon mustard

1 tablespoon balsamic vinegar

1 teaspoon English mustard

1 tablespoon mushroom ketchup

1. Add the sugar to a wide saucepan on a medium heat. Allow to melt then add the onions with a little oil. Stir for a couple of minutes until starting to soften.
2. Stir in the baking powder and leave for a couple of minutes to colour. Gradually add the stock a splash at a time to deglaze the pan, then add the mushrooms and thyme.
3. When the mushrooms have browned, add the remaining ingredients and allow to bubble together for a couple of minutes. Check for seasoning and serve with something really savoury.