Beef Teriyaki with Vegetables is made in handy foil packets so after dinner clean-up is a breeze! A healthy teriyaki sauce is made from scratch and is perfectly sweet, thick, and sticky. Prep this easy steak foil packet dinner for busy weeknight dinners or pop them on the grill for a quick camping meal!
Prepare the homemade teriyaki sauce if making from scratch,
Cut flank steak, against the grain, into ¼-inch slices.
Add cut vegetables to a large bowl and toss with olive oil, salt, and pepper.
Tear off four pieces of aluminum foil that are 15-16 inches long.
Place 4 ounces of steak in the center of each piece of aluminum foil.
Add equal amounts of vegetables to each packet.
Pour 2 tablespoons of teriyaki sauce on top of the vegetables in each packet. (Reserve the remaining ½ cup of sauce.)
Grab the top and the bottom portions of the aluminum foil and twist them together until tight. Fold over the right and left sides of the foil towards the middle and pinch each side together to form a packet.
Place foil packets on a baking sheet and bake in oven for 20-25 minutes, or until beef is cooked to your desired doneness.
Remove packets from the oven and brush with remaining teriyaki sauce.
Turn oven to a high broil and broil the open packets for 2-3 minutes.
Serve beef teriyaki over white rice or cauliflower rice with chopped green onions and toasted sesame seeds. Enjoy!