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Adjust rack to top position (top and middle positions for 4 servings) and preheat oven to 425 degrees. Wash and dry produce.
Zest and quarter lemon. Halve, peel, and cut onion into 1⁄2-inch-thick wedges; mince a few wedges until you have 2 TBSP (4 TBSP for 4). Peel and mince or grate garlic. Roughly chop pistachios. Halve tomatoes lengthwise. Drain and rinse chickpeas; pat very dry with paper towels. Roughly chop parsley and chives.
In a small bowl, combine raisins with juice from one lemon wedge (two wedges for 4).