Fish Tacos

Name: Fish Tacos
Total time: 40 min
Yield: 4 servings
Ingredients: 1/2 cup red wine vinegar; 1/3 cup sugar; 1 teaspoon chili powder divided; 1/2 red onion sliced small; 3 radishes thinly sliced; 1 pound tilapia fillets; 1/4 cup fresh lime juice; 2 garlic cloves minced; 1 mango peeled firm ripe, cut into 1/4-inch-thick matchsticks; 1 avocado sliced peeled firm ripe; 4 tablespoons cilantro leaves fresh, divided; canola oil for brushing grill; 8 corn tortillas 6-inch blue or yellow; salsa verde optional