Onion Gravy - cooking recipe

Ingredients

3 -4 large onions, thinly sliced in rings (at least 1 red onion)
400 ml chicken stock or 400 ml beef stock
100 ml red wine
75 g butter
2 teaspoons French mustard (optional)
1 teaspoon Worcestershire sauce (optional)
salt and black pepper

Preparation

Melt the butter in a heavy pan and cook the onions for about 20 minutes, stirring frequently until soft. Turn the heat down low, do not cover the pan and cook until the onions are brown, this should take about 1 hour so don't try and rush it.
Add the stock, red wine, Worcestershire sauce and mustard.
Bring the gravy to the simmer and reduce slightly, stir frequently, check the seasoning and serve.