Preparation Heat 1 tablespoon oil in a 12-inch heavy skillet over medium heat until it shimmers. Cook bread crumbs until crisp and golden brown, about 4 minutes. Transfer to a bowl and stir in zest and a pinch of salt. Wipe out skillet, then add anchovy paste and remaining 2 Tbsp oil and cook 15 seconds. Increase heat to medium-high and sauté half of frisée until slightly wilted, about 1 minute. Add remaining frisée and sauté until wilted, about 2 minutes more. Off heat, stir in juice, syrup, 1/8 teaspoon salt, and 1/4 teaspoon pepper. Serve topped with bread crumbs.
Preparation Heat 1 tablespoon oil in a 12-inch heavy skillet over medium heat until it shimmers. Cook bread crumbs until crisp and golden brown, about 4 minutes. Transfer to a bowl and stir in zest and a pinch of salt. Wipe out skillet, then add anchovy paste and remaining 2 Tbsp oil and cook 15 seconds. Increase heat to medium-high and sauté half of frisée until slightly wilted, about 1 minute. Add remaining frisée and sauté until wilted, about 2 minutes more. Off heat, stir in juice, syrup, 1/8 teaspoon salt, and 1/4 teaspoon pepper. Serve topped with bread crumbs.