Salsa - combine the mandarin oranges, diced avocado, red onion and chili powder in a bowl, mix to combine.
Yogurt Crema - combine the yogurt, lime juice and cumin, mix to combine
Grilled Fish - Preheat your grill or oven to 350 degrees. In a cast iron skillet large enough to fit the fish fillets, drizzle the skillet with oil. Add the fillets and dust the fillets lightly with cumin, chili powder and salt. Grill or bake for 8 - 10 minutes or until the fish flakes easily.
How to serve you tacos
Heat the corn tortillas over the grill - turn the tortillas with tongs until lightly charred on both sides. This can also be done over a gas flame or in a dry skillet. Set warm tortillas in a towel-lined basket to keep warm.
Place the shredded cabbage, salsa, and yogurt crema in serving bowls along side the fish and tortillas.