Combine water and farro in a medium saucepan. Bring to a boil. Reduce heat to medium, partially cover and simmer until farro is tender, about 20 to 25 minutes. Drain well. While grains are cooking, in a large bowl stir together onion, garlic paste, vinegar, and oil.
Drain grains well and add to onion mixture. Toss mixture well and cool. Add scallions, corn, tomatoes, chives, and parsley, toss well, and season with salt and pepper, to taste. Salad may be made 1 day ahead and chilled, covered. Bring salad to room temperature before serving.
Recipe courtesy of Gourmet Magazine