Ingredients:
* 5 Very large yellow onions
* 1 Tbsp Mustard seeds
* 4 Bay leaves
* 2 Tbsp Worcestershire sauce
* 2 Tbsp Balsamic Vinegar
* 2 Tbsp Dark brown sugar
* 1 Generous Knob of butter
* Salt and Pepper
Method:
Peel the onions, top and tail and then cut into halves length ways, and then slice thinly into half-rings.
In a medium saucepan on medium heat, add the knob of butter, and then the onions.
Add a fair amount of salt (about 6-8 turns of the grinder) now, as this helps the onions to lose their water. add the same amount of pepper - or to your taste.
When the onions turn translucent, add the mustard seeds and bay leaves.
Keep cooking the onions stirring occasionally, until all the water evaporates, and the onions start to catch on the bottom of the pan.
Mix the Worcestershire sauce, vinegar, and sugar in a small bowl or cup and then add to the onions.
Continue to cook stirring frequently, until the sugar caramelises, and becomes thick and syrupy, and the colours turns a rich dark brown.
(be very careful as it may burn easily at this stage)
Ladle into a sterilised jar, or serve immediately with your roast meat or steak.