
Place the farro, apple cider, bay leaves, 2 teaspoons salt, and 2 cups water in a medium saucepan, bring to a boil, lower the heat, and simmer uncovered for about 30 minutes, until the farro is tender and liquid evaporates. If all the liquid evaporates before the farro is done, add a little more water. Let farro cool, then discard the bay leaves.
Before serving, stir in the pistachios, parsley, mint, tomatoes, and radishes. Add the arugula and lightly fold in the parmesan so as not to break it up too much. You can add as much or as little arugula as you like, whether you want this to be more of a side or more of a salad. Sprinkle with sea salt to taste, and serve immediately.