Pour about ½ cup of boiling water over the dried cherries or cranberries and leave them to soak for about 30 minutes. Take the parsley leaves off the large stems; small sprigs of three leaves are fine. You should have 5 to 6 cups. Wash the parsley well and spin it in a salad spinner. Wash the radicchio, quarter it lengthwise and core it, and cut the quarters in ½-inch strips.
Toss together the parsley, radicchio, sliced radish and celery, capers and walnuts. Drain the fruit, and add it to the salad. Shortly before serving, sprinkle the salad with the sea salt and toss gently. Then add the olive oil, lemon juice and agave, and toss again. Taste, add more lemon juice or salt if you like, and grind on some black pepper.
Grated or finely diced cheese can be added now and tossed with the whole salad, or it can be passed at the table as a garnish.