Overnight-Marinated Flank Steak

Step 1
Whisk vegetable oil, soy sauce, red wine vinegar, lemon juice, Worcestershire sauce, mustard, garlic, and black pepper together in a bowl; pour into a resealable plastic bag. Add flank steak to the bag, coat with the marinade, squeeze bag to remove excess air, and seal the bag.

Step 2
Marinate in the refrigerator 8 hours to overnight.

Step 3
Preheat an outdoor grill for medium-high heat and lightly oil the grate.

Step 4
Remove steak from the bag and shake off excess marinade. Discard remaining marinade.

Step 5
Cook the steak until beginning to firm and is hot and slightly pink in the center, 5 to 7 minutes per side. An instant-read thermometer inserted into the center should read at least 140 degrees F (60 degrees C).

Step 6
Rest steak 5 to 10 minutes before slicing across the grain.