Process bread in a food processor 30 seconds to 1 minute or until coarsely crumbled.
Melt butter with garlic in a large skillet over medium heat; add breadcrumbs, and cook, stirring constantly, 2 to 3 minutes or until golden brown. Remove from heat, and stir in parsley and lemon zest.
Cook Broccolini in boiling salted water to cover 3 to 4 minutes or until crisp-tender; drain well. Toss Broccolini with lemon juice, olive oil, and salt and freshly ground pepper to taste. Transfer to a serving platter, and sprinkle with breadcrumb mixture.