Summer Kitchen Spicy Korean Citrus Marinade is our favourite product to use for flank steak. It has all the ingredients you want in an Asian inspired dish: rice vinegar, ginger, garlic, orange juice, miso, sesame oil, and a light touch of soy. There is a nice level of spice from red pepper flakes but it isn't overpowering.
We prefer to marinate flank steak overnight, turning a couple of times to coat evenly with the marinade.
This is also a great marinade for chicken thighs and pork loin. Let them sit a few hours to half a day. No need for overnight marinating. Try it with shrimp for a quick 30-minute marinade.