Add the diced onion and green pepper. Mix in with the beef and cook until softened, stirring occasionally. Add the minced garlic and cook for a further 5 minutes.

Add the cans of diced tomatoes and tomato sauce and stir well to combine. Continue cooking on medium low heat, stirring occasionally until liquid has reduced slightly. (If sauce becomes too thick, add a splash or two of beef or chicken stock.)

Meanwhile bring a pan of salted water to the boil and add the spaghetti. Return to the boil, stirring occasionally. Boil uncovered 8-9 minutes or until desired tenderness. Remove from heat and drain.