Warm the tortillas over an open flame or in a hot, dry skillet until lightly charred in spots. Set aside and keep warm.
In a nonstick skillet over medium heat, cook the eggs to your liking. Warm the sausage slices, either in a separate skillet or alongside the eggs.
Divide the eggs, sausage and avocado among the tortillas. Sprinkle with the cheese and let it melt slightly from the heat. Top with red onion and cilantro, then drizzle with sriracha. Finish with a squeeze of lime juice, a pinch of sea salt and a grind of black pepper.