In a very large bowl, combine the soy sauce, olive oil, sesame oil, cilantro, garlic, lemon juice, and ginger. Season the steak with salt and pepper then add the soy sauce mixture. Gently rub the mix on both sides of the steak. Cover and marinate in the fridge for at least 4 hours or overnight.
Preheat grill to high heat. Remove steak from the marinade. Grill for about 3 to 4 minutes per side depending on how well done you want your steak. Let stand for few minutes before slicing against the grain.
Grill the corn as well. Cut off the corn kernels into a bowl. Add the other salsa ingredients. Season with salt and pepper. Serve steak with the corn salsa. Yum!
Recipe by Gluten-Free by Jan at https://glutenfreebyjan.com/gluten-free-grilled-flank-steak-with-corn-salsa/