Pita Panzanella Salad with Meatballs
To make ahead: Prepare meatballs (Step 2) up to 2 days ahead and refrigerate. Prepare croutons (Step 3) up to 2 days ahead and store in an airtight container at room temperature. Prepare vinaigrette (Step 4) up to 2 days ahead and refrigerate. Prep all vegetables, except for tomatoes, up to 1 day ahead and refrigerate.