La Fonda on Main Avocado Poblano Soup

Source: San Antonio Express-News - La Fonda on Main restaurant, San Antonio, Texas

1 pound poblano chiles, washed, seeded and coarsely chopped (skin on)
2 carrots, washed, peeled and roughly chopped
1 white onion, peeled and roughly chopped
2 tablespoons canola oil
1 clove garlic, minced
1/3 cup flour
1/2 gallon (8 cups) fresh chicken stock
2 avocados, halved, seeded and peeled (pebbly-skinned brown-black
    Haas are preferred)
1/4 cup chopped cilantro
1 cup heavy cream
Salt, to taste
Pepper, to taste
Corn tortillas, cut in strips and fried in hot oil, for garnish

In a large stock pot, saut