For the Steak

• Mix together all of the ingredients in a large bowl.
• Add the flank steak and toss to coat.
• Wrap the bowl with saran wrap and place in the fridge to marinate for 3 hours or overnight. Overnight is clearly better for flavor, but even an hour of marinating is better than none at all.
• Remove the meat from the fridge and let rest on the counter for 5-7 minutes to take the chill off the meat.
• Heat a grill to high heat and place the meat directly on the grill.
• Grill the meat for about 4-7 minutes per side depending on the size of the meat. Flank steak should be cooked to medium for the best flavor and texture.
• Remove from the grill and tent with foil for 5-10 minutes.
• Slice thin and drizzle with the chimichurri.

Mango ChimiChurri

• In a small bowl whisk together the vinegar, olive oil, sea salt, pepper, red pepper flakes, oregano and garlic.
• Add the mango and cilantro and stir to combine.
• Set aside to serve over the cooked meat.

Source: ohsweetbasil.com