the best marinated flank steak

Ingredients

• 2 pounds flank steak
• 1/4 cup sesame seeds
• 1/4 cup oil
• 1/4 cup soy sauce, dark
• 1/4 cup corn syrup, dark
• 2 tablespoons dry white wine
• 1 small onion, sliced into thin rings
• 1/8 teaspoon garlic powder
• 1/4 teaspoon ground black pepper
• 1/4 teaspoon ground ginger