my own version of marinara sauce

This pasta recipe was done because of my boredom during weekends plus the ingredients i found in the pantry are just perfect for this dish.. so here is the recipe and sorry for some estimates of measurements.. anyway this is not baking, i hope its tolerable..

SAUCE for 400 grams of spaghetti or linguine

tomato paste of your choice about 200 grams
fresh tomatoes blanched, peeled and deseeded
salt
pepper
a sprig of fresh rosemary (from my garden..) but a teaspoon or less of dried rosemary will do
1 tablespoon of store bought pesto sauce
garlic
a knob of butter
about 10 pieces of prawns... peeled and deveined
parmesan cheese

1. Cook pasta and set aside, make sure that it is still al dente
2. Saute garlic with butter. Add the prawns and pesto. set aside
3. On the same pan, saute the fresh tomatoes and tomato paste for 5 minutes.
4. Add some water until you achieve the consistency of a sauce.
5. Add the seasonings and rosemary. simmer for 15 minutes on low fire.
6. Add the pasta and cook for another 5 minutes.
7. Lastly, generously mix the parmesan cheese..

Enjoy,,, BON APPETIT!