Step 1

Melt 1 tbsp butter into a pan and begin frying the onions over medium heat. Once they start to take on colour, turn the heat down to low-medium and fry until soft and caramelized. The lower and slower you fry the onions, the more they'll caramelize and the sweeter they'll be. Around 30mins will get you soft and sticky onions though.

Step 2

Melt in 1 tbsp butter then stir in 2 tbsp flour until a paste forms. Stir in the wine, then slowly stir in the beef stock, whisking as you go to ensure no lumps form. Add in Worcestershire sauce and redcurrant jelly, then season to taste with salt and pepper (you may not need salt as the butter and stock will already add saltiness).

Step 3

Allow to simmer, stirring occasionally, until your desired thickness. It will thicken, just keep simmering away. Take into consideration that the gravy will thicken as it cools. Serve up and enjoy! (see notes for make ahead)