1. Whisk first 6 ingredients (through the first vegetable oil) together in large bowl. Stir flank steak strips into the marinade to coat. Cover and refrigerate for at least 1 hour then proceed with step 2.
2. When ready for dinner, in a small bowl, stir together the soy sauce, brown sugar, garlic, flour, and sherry until smooth. Set aside.
3. In large wok or saute pan, heat 2 Tb vegetable oil over high heat until shimmering. Add broccoli and saute 3 minutes, stirring often. Transfer broccoli to a plate.
4. Carefully add the remaining Tb of oil to the hot pan. Add the marinated meat and half the sauce mixture and saute for 3-4 minutes, stirring often, until the meat is cooked through and no longer pink. Stir in the broccoli and remaining sauce. Saute 1 minute more. Serve.
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