Fish Tacos

Name: Fish Tacos
Prep time: 30 min
Cook time: 10 min
Total time: 40 min
Cuisine: American, Mexican, Latin American
Ingredients: 3 tablespoons olive oil; 6 tablespoons lime juice, divided; 1 teaspoon chili powder; 3/4 teaspoon pepper, divided; 1 1/2 lbs halibut fillets, cut into 6 (4 ounce); 1/2 English cucumber, sliced; 1/2 red onion, cut into thin strips; 2 tablespoons orange juice; 1 teaspoon sugar; 1/4 cup reduced-fat mayonnaise; 1/4 cup reduced-fat sour cream; 12 corn tortillas; 1 teaspoon serrano chili, seeded and minced; 1 1/2 cups salsa