Henderson’s Burger

For the Hendo’s Caramelised Onions

Peel and halve the onions before thinly slicing them. Add the butter to a large pan, and when melted add the onions. Sauté until soft, then add the sugar and Henderson’s Relish. Cook for a further 30 to 40 minutes, stirring occasionally until the onions are a dark brown colour and have a slightly jammy texture. Season to t