DO-AHEAD TIP: Cook brown rice according to package directions.
Cook rice according to package directions.
Meanwhile, heat the olive oil in a large skillet over medium heat; add garlic and sauté for 1 minute. Add flank steaks and brown well, about 3 minutes per side. Squeeze the juice of 1 lime over the steaks.
Slice the other lime into 6 wedges and set aside. Continue to cook steaks until desired level of doneness is achieved.
Serve over rice with a lime wedge next to each steak; sprinkle with cashews and chopped cilantro.