Firstly, preheat your oven to 200 degrees C. Then, boil water for your pasta, season it with salt. Then, place your pasta into the saucepan and cook for 8 minutes.
Next, take a big onion and finely chop it. Then, chop 2 cloves of garlic. Heat a deep pan, add some olive oil and place chopped onion and garlic. Next, add a teaspoon of chili flakes. Cook for 3 minutes. Then, add 600 g of tinned tomatoes. Mix that all together. Then, add 12 g of fresh basil leaves. Bring that to boil and let it simmer for 20 minutes. After that, add your tuna. Season with salt and pepper, and give a good mix.
Then, drain your pasta and add it to the sauce. Then, place the mixture into an oven-proof dish.
Grate 150 g of cheddar and sprinkle it over your pasta. Put a nice couple of basil leaves on top. Season with pepper. Finish with a little drizzle of olive oil on top.
Place your pasta into the oven for 15 minutes at 200 degrees C.