1. Wash the onion, peel it and cut into shreds.
2. Put the spaghetti in a hot water pot and cook it in high heat, add a little salt until it is ripe. Take it out and put it into the sieve. Drain the water. Mix the pasta with olive oil. Set aside.
3. Heat the pot and melt the butter.
4. Stir fry onion.
5. Pour in the clam and the clam, stir fry to taste.
6. Stir fry until clams are uncovered and soup is put in rosemary.
7. Add the cooked pasta.
8. Put in three pieces of cheese.
9. Until the cheese melts and sprinkles in, add black pepper and salt to taste, sprinkle in parsley and turn off the heat.
When clam food is bought back, it can be soaked in light salt water for a while to make it spit sand effectively.