Ground Turkey Tacos

Name: Ground Turkey Tacos
Ingredients: 2 tablespoons olive oil; 1 small yellow onion, chopped (1 cup); 1 pound ground turkey (dark and light meat); 1 tablespoon chili powder; 1 teaspoon coarse salt; 1 tablespoon tomato paste; 1 cup chicken broth or water; 6 ounces cheddar cheese, shredded; ½ head iceberg lettuce, shredded; 1 medium red tomato, cored and chopped; 10 hard taco shells; Sour cream, for garnish; Lucinda's Pico de Gallo , for garnish; Avocado, for garnish