Clams are usually heavily silted. Therefore, start desanding the clams a few hours in advance.
Place the clams in heavily salted cold water (5 tbsp. salt to 250 ml water). This water must be renewed two to three times. After 5 to 6 hours the sand is rinsed out.
Brush the mussels very thoroughly under running water. Discard open mussels that do not close when tapped with a finger. Put the mussels in a saucepan with water or wine, put the lid on and let them boil at the highest temperature. Cook the mussels for 3-4 minutes until they open.
While cooking, lift the pot 1-2 times and shake it vigorously. Pick out closed mussels – they are probably dead. Remove the meat from the shells of half the mussels and keep them in the strained mussel broth.
Peel the garlic cloves, finely chop the pepperoncino pod, and quarter the cherry tomatoes. Rinse and finely chop the parsley. Sauté the garlic, pepperoncino and cherry tomatoes in the olive oil over low heat for 5-6 minutes. Add the mussel meat, mussel broth and whole mussels and heat gently repeatedly. Do not make the sauce, because then the mussels will get a tough and rubbery consistency. Very gently season strongly with salt and freshly ground pepper.
Cook the spaghetti so that they are cooked at the same time as the mussels. In a