Grilled Chorizo, Goat Cheese, and Watercress Pita Pizzas

Name: Grilled Chorizo, Goat Cheese, and Watercress Pita Pizzas
Yield: Servings
Ingredients: 14 ounces fresh pork or beef chorizo sausages, plastic casings removed; 4 cups (packed) watercress tops, divided; 8 ounces soft fresh goat cheese, crumbled; 8 5- to 6-inch-diameter pita breads; Olive oil; 3 mini sweet peppers (1 yellow, 1 orange, and 1 red), cut into thin rings