Shrimp Burritos with Poblano Pepper Jack Sauce

Name: Shrimp Burritos with Poblano Pepper Jack Sauce
Ingredients: 2 tablespoons butter; 2 tablespoons all purpose flour; 1 ½ cups chicken stock; 1 large poblano, minced (reserve 2 tablespoons); ¾ cup sour cream; 1 clove garlic, minced; salt and pepper; 2 cups freshly grated pepper jack cheese; 3 tablespoons cilantro, chopped; Burrito Stuffing; 1 pound small shrimp, peeled and deveined; 2 tablespoons oil; ½ cup onion, diced; 4 teaspoons minced garlic; 1 ½ cups shredded carrots; 3 cups fresh baby spinach,packed; 1/2 teaspoon Sriracha sauce; 1 dozen flour tortillas