METHOD
- In a large saucepan, fry off the onion with a pinch of salt until soft. Add in the garlic and fry for a minute or so. Add in the apple, cook until soft and tender.
- Add in the vinegar and reduce by half. Add in the sugar, worcestershire, mustard powder and a pinch of salt. Stir to combine all the ingredients then add 1 cup of water. Turn the heat down to low and cook until everything has broken down.
- Blend until smooth. Taste and adjust the seasoning to your liking. Add in the grain mustard, stir through and then store in a jar in the fridge.