Chop the herbs and mash thoroughly with the garlic, pimiento, and tomatoes, adding the oil very slowly, and the lemon juice. Add about 3 glasses of cold water [I still say this is the correct liquid. But often I use good meat or fish stock.] or as much as you wish. Put in the onion and the cucumber, season, sprinkle with bread crumbs, and ice for at least 4 hours before serving.