In a small bowl, whisk together orange juice, lime juice, oil, soy sauce, cilantro, garlic, jalapeño and cumin. Taste and if needed, add salt.
Place steak in a resealable plastic bag, pour ingredients over the top. Seal bag and massage marinade into meat. Refrigerate 8 hours or overnight.
Remove meat from fridge one hour before you want to cook it to allow to come to room temperature.
Remove meat from marinade and pat dry.
Heat grill to medium-high heat. Grill steak 3 - 5 minutes per side for medium rare. Use a meat thermometer for the most accuracy and remember the temperature will rise a couple of degrees while the steak rests.
Allow steak to rest 10 minutes before slicing against the grain. Serve.