You'll need: Stovetop or propane burner, large heavy saucepan.
To make the farro: In a large heavy saucepan over medium-high heat, combine the farro, salt, and water (or stock, if using). Bring to a simmer, cover, and cook, stirring occasionally, until the farro is tender, 35 to 45 minutes. Check a few times while it is cooking; you want it to be al dente. Remove from the heat, drain any excess water, and set aside to cool.
While the grains are simmering, make the vinaigrette:
Whisk together the orange zest, shallot, mustard, vinegar, and olive oil. Add salt and pepper to taste and set aside.
To serve, toss the farro with 3 tablespoons dressing and transfer it to a large serving bowl. In the same bowl, combine the arugula with the diced pepper, orange wheels, almonds, prunes, cherries, onion, and apple and gently toss with 3 tablespoons of the dressing, adding more as needed.
You can boil the farro 1 day in advance, then store it in an airtight container in the fridge. The vinaigrette can be made a day ahead as well.
Copyright 2014 by Guy Fieri, by arrangement with HarperCollins Publishers