Toast chiles in a dry heavy skillet (not nonstick) over medium-high heat, turning with tongs, until pliable and slightly changed in color, about 30 seconds. Coarsely crumble 1 pasilla chile and set aside.
Purée tomatoes, onion, garlic, chiles de á:rbol (including seeds), and remaining 3 pasilla chiles with 1/2 cup stock in a blender.
Heat lard in a large heavy pot over medium heat until it shimmers, then cook purée, stirring frequently, until reduced by half and beginning to stick to pot, 15 to 20 minutes. Stir in remaining 7 1/2 cups stock, epazote, and 1 teaspoon salt, then simmer, uncovered, 45 minutes.
While soup simmers, heat 1 inch oil to 350°F in a deep 10-inch heavy skillet, then fry tortilla squares, a handful at a time, until golden, 30 to 45 seconds per batch. Transfer with a slotted spoon to paper towels to drain and season lightly with salt.
Divide tortillas and avocado among soup bowls and ladle in soup. Sprinkle with cheese, drizzle with crema, and top with crumbled chile.
Cooks notes: Soup can be made 3 days ahead and chilled (covered once cool). Tortillas can be fried 1 day ahead and kept in an airtight container. Rewarm in oven. You can use unsalted store-bought tortilla chips in place of homemade.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	1432.77 Kcal (5999 kJ)
Calories from fat	733.74 Kcal
		% Daily Value*
Total Fat	81.53g	125%
Cholesterol	97.19mg	32%
Sodium	1940.43mg	81%
Potassium	2001.07mg	43%
Total Carbs	147.21g	49%
Sugars	7.27g	29%
Dietary Fiber	19.47g	78%
Protein	33.75g	68%
Vitamin C	29.2mg	49%
Vitamin A	0.7mg	24%
Iron	3.7mg	21%
Calcium	557.7mg	56%

Amount Per 100 g
Calories	288.48 Kcal (1208 kJ)
Calories from fat	147.73 Kcal
		% Daily Value*
Total Fat	16.41g	125%
Cholesterol	19.57mg	32%
Sodium	390.69mg	81%
Potassium	402.9mg	43%
Total Carbs	29.64g	49%
Sugars	1.46g	29%
Dietary Fiber	3.92g	78%
Protein	6.8g	68%
Vitamin C	5.9mg	49%
Vitamin A	0.1mg	24%
Iron	0.7mg	21%
Calcium	112.3mg	56%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.

Tastes

salty
savory
bitter
sweet

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