How to Make It
Heat oven to 425° F. Place an oven-proof wire rack set in a baking sheet. Pulse the bread until fine crumbs form in a food processor (you should have about 2½ cups). Add 1 tablespoon of the oil, ½ teaspoon salt, and ¼ teaspoon pepper and pulse once or twice to moisten.
Spread the bread crumbs on a rimmed baking sheet and bake, tossing once, until golden brown, 4 to 6 minutes. Let cool and transfer to a shallow bowl.
Place the flour in a second shallow bowl. Beat the egg whites with 1 tablespoon water in a third shallow bowl.
Season the pork with ½ teaspoon salt and ¼ teaspoon pepper. Coat with the flour (tapping off any excess), dip in the egg whites (shaking off any excess), then coat with the bread crumbs (pressing gently to help them adhere). Place on the prepared pan and bake until cooked through, 8 to 10 minutes.
Meanwhile, toss together the chickpeas, fennel, celery stalks and leaves, onion, lemon juice, the remaining 2 tablespoons of oil, ½ teaspoon salt, and ¼ teaspoon pepper in a medium bowl. Serve over the pork with the lemon wedges.