Asian-Style Hamburgers - cooking recipe

Ingredients

1 1/2 lbs ground beef
1/4 cup vegetable oil
1/4 cup soy sauce
2 tablespoons ketchup
1 tablespoon white vinegar
2 garlic cloves, minced
1/4 teaspoon pepper
6 hamburger buns, split
6 leaves lettuce, and (optional)
tomatoes, slices (optional)

Preparation

Shape meat into six patties and place in a shallow dish.
In a bowl, whisk together the oil, soy sauce, ketchup, vinegar, garlic and pepper.
Set aside 1/4 cup for basting and refrigerate.
Pour remaining marinade over the patties.
Cover and refrigerate for at least 3 hours.
Grill burgers, uncovered, over medium heat for 5-6 minutes on each side until meat juices run clear, basting with reserved marinade.
Serve on hamburger buns with lettuce leaves and tomato slices if desired.