score flank on both sides, in a diagonal crosshatch pattern rub with pepper all over combine breadcrumbs, celery, onions, salt, thyme, one-fourth the butter, white pepper, and just enough water to make a thick paste-mix well spread paste onto steak, leaving a 3 cm border all around rollup lengthwise and secure with string dredge in flour, patting with your hands to remove excess heat 2 tablespoons butter in a dutch oven, over a moderate flame add rolled flank and brown well on all sides add 1 cup water bring to a boil, reduce heat to very low, cover, and simmer for 2 hours remove to a serving platter remove string and keep warm combine ginger, cornstarch, and 2 tablespoons water-mix well add to dutch oven and place over a medium-low flame heat and stir until thickened pour into a gravy boat serve flank steak hot, with gravy to the side ----