Makes 1 tart, serves 6 to 8 people INGREDIENTS 1 cup farro 2 tablespoons butter, plus more for greasing pie dish 1 tablespoon olive oil ½ of a red onion, chopped finely 2 cloves garlic, chopped ¼ cup of each of the following fresh herbs: parsley, basil, and chives, chopped ½ cup Parmesan cheese, grated…