In medium-size saucepan, bring water to a boil. Add the farro and stir. Turn the heat down to low and simmer for about 30 minutes, until the farro is soft. Drain and set aside.

In a small bowl, combine oil, vinegar, lemon juice, mustard, and honey; whisk well and set aside.

In large bowl, combine the cooked farro with the kale, grapes, pistachios, and feta. Toss farro mixture with the vinaigrette and serve immediately.

Note: If preparing ahead of time, wait to add the dressing until ready to serve.