In a bowl add the mangos, red onion, jalapeno, cilantro, lime juice, and kosher salt, mix together and place in the refrigerator until fish is ready.
To make fish & tortillas:
Season fish evenly on both sides with all-purpose seasoning. Heat a large skillet over medium heat add 2 tablespoons of oil; once hot add fish and cook for 1 ½ minute on each side. Cook fish in batches, so as not to overcrowd the skillet. Remove fish from skillet and set aside.
In the same skillet, add the red onion and jalapeno, cook for 2 minutes then add the garlic and cook for 30 seconds. Add fish back to the skillet in addition to the orange juice, lime juice, salt and black pepper, cook for 10 minutes, until the sauce thickens. Stir occasionally and fish should start to fall apart as it cooks.
While fish cooks, heat a small skillet over medium-high heat, add 1 teaspoon of oil and add 1 tortilla, cook for 30 seconds each side. Place finished tortillas on a plate and cover with a damp paper towel.
In each tortilla add 2 heaping tablespoons fish, 2 teaspoons mango salsa. Add your favorite toppings like sour cream, green salsa, and/or Tajin seasoning for garnish.