Puree the tomatoes and mix with the olive oil, add the couscous and leave to soak in the refrigerator.
Chop the onion and wild garlic, crush the walnuts and mix everything with the couscous, season with the juice of the lemon, salt and pepper, and let it steep again in the refrigerator until you eat it.
If you like it, you can also add a little mint, or do not puree the tomatoes completely so that they stay a little bit more chunky. The amount of wild garlic is variable depending on the taste.