Braised Brisket Tacos with Matzo Tortillas

Name: Braised Brisket Tacos with Matzo Tortillas
Ingredients: 2 pounds lean brisket; Kosher salt; Cracked black pepper; 1/4 cup canola oil; 1 cup diced Spanish onion; 1 cup diced carrots; 1 cup diced celery; 5 garlic cloves; 2 cups canned tomato puree; 2 tablespoons chipotle puree; 5 sprigs fresh thyme; 1/4 teaspoon dried cumin; 1/4 teaspoon dried Mexican oregano; 1 bay leaf; 2 cups fine matzo meal; 1 tablespoon salt; 1 cup warm water; 1 tablespoon olive oil; 1 small red onion, thinly sliced; 1 Hass avocado, peeled and thinly sliced