Bring water to a boil in a large pot. Place the marrow in the pot and cook for 5-10 minutes.
Heat some olive oil in a pan and soften chopped onion, garlic and tomatoes.
Heat some olive oil in a pan and cook the minced meat until brown. Season to taste and add onions, garlic, tomatoes and chopped tomatoes. Leave to simmer for about 5 minutes.
Take out the marrow, cut in halves, and leave to cool down. Scrape out the seeds and fill with the meat sauce.
Finish off with some cheese and bake for 15 minutes at 180-200°C (Gas Mark 5).
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