In a large heavy based pan heat a little oil to a medium-high heat.

Add the diced onion and sauté for around five minutes until the onions are nicely browned.

Remove the onions from the pan and set aside.

Return the pan to a high heat and add a little more oil, place the beef mince into the pan and stir well.

Continue cooking the beef mince, stirring constantly until the beef is well coloured and any liquid has evaporated.

Add the chopped garlic to the beef mince and cook for 10-20 seconds.

Return the cooked onion to the beef mince, stir well and add both the flour and cornflour.

Reduce the heat and stir the flours with beef mixture for 2-3 minutes, then add the beef stock.

Bring the mixture to a gentle simmer, cook for a further 5 minutes and season with salt and pepper.

Remove the mixture from the pan and allow to fully cool.