1. Heat a large greased grill pan on high. Season the tuna with salt and pepper. Add to pan and grill 2–3 min. per side, until desired doneness.
2. Meanwhile, microwave the rice according to package directions. Thinly slice the green onions. In a small bowl, stir together the soy sauce, lime juice, 1 tbsp water, and sliced green onions.
3. Thinly slice tuna steaks and serve over rice with dipping sauce.