Step 1

Zest all of the oranges to make approximately 4 tablespoons of zest. Add 2 tablespoons of the zest to a gallon freezer bag and 2 tablespoons to the bowl of a food processor for the chimichurri sauce. Squeeze the juice from 2 of the oranges into the gallon freezer bag and save the other orange for another use. Set 1 cup of the canola oil aside for the chimichurri to add later, and add the remaining 2 tablespoons of the canola oil to the freezer bag with 5 of the peeled garlic cloves roughly chopped or smashed. Add the other peeled and smashed garlic cloves to the food processor. Roughly chop the peeled and smashed ginger and add half to the marinade and half to the food processor along with the fresh herbs, rice wine vinegar, and sesame oil. To finish the chimichurri sauce, pulse the herb mixture while drizzling in the 1 cup of canola oil. Refrigerate until ready to use.

Step 2

To finish off the marinade, add the soy sauce and brown sugar to the gallon bag, seal the bag and massage the marinade together, add the steak, seal, and marinade at room temperature for 30 minutes or refrigerate up to 24 hours.

Step 3

Preheat the grill to high. Pull the steak from the marinade and allow to rest at room temperature for 30 minutes if refrigerated. Place the steak on the hot grill ad baste with the remaining marinade, cooking for for 5-7 minutes on each side for medium rare, or until steaks come to 125 degrees F. Transfer to a plate or cutting board and rest for 10 minutes.

Step 4

Going against the grain, cut the flank steak into thin slices and dress with the chimichurri sauce and serve.