Remove the skins from the sausages and then break them up into 1-1.5cm (½") pieces with your hands.
Cut the onion in half, peel it and cut it into a 2-3mm (⅛") dice.
Cut the carrot into a 2-3mm (⅛") dice.
Peel the garlic cloves and dice them as finely as you can.
Heat a 28cm or 11" frying pan over a medium-high heat, and when it is hot, add the olive oil, diced onions and carrots, then cook for 5-7 minutes, stirring regularly.
Throw in the anchovies, garlic and broken-up sausage and cook until the sausage has become golden with some crispy edges. This will take another 5-6 minutes.
Add the chilli flakes, sugar, salt, oregano, Worcestershire sauce and chopped tomatoes, stir to combine and reduce the heat to very low, then add a lid and simmer for 30 minutes before serving.