
Step 1 · Brown the Beef
Heat the oil in a large frying pan over high heat. Add the beef and cook for 5 minutes, breaking it up, until browned.
Step 2 · Cook the Onion and Garlic
Add the onion and cook for 3 minutes. Add the garlic, tomato purée and oregano and stir for 30 seconds.
Step 3 · Simmer the Sauce
Add the tomatoes, beans and salt. Simmer over medium-high heat for 6 to 8 minutes, until slightly thickened.
Step 4 · Wilt the Spinach
Add the spinach in handfuls and stir until wilted.
Step 5 · Melt the Mozzarella
Dot the mozzarella over the surface. Either cover the pan over low heat for 2 to 3 minutes, or place it under a hot grill/broiler, until the cheese melts.
Step 6 · Adjust Seasoning and Serve
Taste before adding more salt and serve with wholegrain bread for mopping up the sauce.