In A Small Bowl, Combine Flour, Broth, Sugar, And Soy Sauce. Stir Until Sugar And Flour Are Dissolved. In A Large Skillet Or Wok Over High Heat, Cook And Stir Beef 2 To 4 Minutes, Or Until Browned. Stir In Broth Mixture, Ginger, Garlic, And Broccoli. Bring To A Boil, Then Reduce Heat. Simmer 5 To 10 Minutes, Or Until Sauce Thickens.