In a large saucepan, bring 4 cups of water plus the lime juice to a boil. Add the brown rice, wild rice and chopped red onion. Return to boil, reduce heat to medium, cover and let cook for 45 to 50 minutes, or until brown and wild rices are tender.
Once the rice has cooked, add the diced green pepper, diced jalapeno, corn, diced tomatoes, black beans, cumin and chili powder. Mix well. Season with salt and pepper to taste.
Serve with some steamed broccoli or other favorite vegetable. Or serve as a one dish dinner.