Clean the clams thoroughly.
Finely chop the onion and garlic.
Heat olive oil in a pot and sauté the garlic and onion.
Add the prepared clams and stir-fry.
Pour in white wine and cook off the alcohol.
Add diced tomatoes (or fresh tomatoes).
Pour in water and add herbs (basil, thyme, etc.), then bring to a boil.
Season with salt and pepper to taste.
Turn off the heat when the clams open.