Add the pork joint to the slow cooker and pour in the coca cola until the joint is covered.

Add the mustard, tomato purée and sugar into the coke.

Cook on medium for around six hours until the pork is meltingly soft.

Pull the pork into strips using two forks.

For the sauce.

Chop the onions and garlic into small pieces.

Place in a pan with the rest of the ingredients and bring to the boil.

Simmer for around 15 minutes until the sauce thickens.