Prepare the ingredients as instructed above.
Prepare and cook the rice according to the directions on the package. Once tender, season with salt and pepper.
Preheat the grill or grill pan over medium heat.
Season the tilapia with cumin, cayenne, salt, and black pepper. Drizzle with olive oil.
Grill the fish to an internal temperature of 145°F (63°C). Cut into pieces.
Warm the taco shells on the grill if desired.
Grill asparagus: Drizzle with oil, lemon zest, salt, and pepper. Grill the asparagus until nicely charred and tender on all sides.
Prepare virgin margaritas: Mix all ingredients until combined. Adjust ingredients as needed to taste. Serve over ice, if desired.
Prepare tacos: Fill the taco shells with fish, top with lettuce, radish, and cilantro, and serve with lime wedges on the side.
Serve with brown rice, grilled asparagus, and virgin margaritas.