If you made panzanella with pita instead of Italian bread, you'd have fattoush. Once just a thrifty way of making use of stale pita bread, Lebanese fattoush has grown into a desirable dish in its own right.
The secret, notes Nancy Harmon Jenkins, is in the sumac. The purplish-red spice gives the crispy pita salad its signature sour flavor. You can find it whole or powdered at Middle Eastern grocery stores.
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