In a dry pan on the stove top or on a hot grill, warm tortillas about 30 seconds per side. Transfer to platter and cover with foil to keep warm.
To assemble a burrito, spread refried beans on the bottom center of a tortilla. Top with ⅙ of the Carne Asada, cheese, avocado slices, Pico de Gallo, sour cream and hot sauce (optional). Fold bottom side of tortilla over toppings and gently pull back to shape filling. Fold up both sides of tortilla toward the center and tightly roll into a cylinder. Repeat with remaining tortillas.
Alternatively, serve warmed tortillas with thinly sliced Carne Asada and individual toppings family-style letting everyone assemble their own burritos.