Preheat the oven to 400 degrees.
For the salsa verde: Place the tomatillo, garlic, and onion on a foil lined baking sheet. Toss with oil and roast in the oven until soft, about 10 - 15 minutes. Add all of the ingredients to a blender or food processor and blend until smooth. Add more lime juice if needed to taste. Season with salt to taste and set aside until ready to serve.
Heat the half of oil in a non-stick pan over medium heat. Crumble in the chorizo sausage and brown until cooked through. Then set aside in a bowl.
In the same pan on medium heat, add the remaining oil. Crack the eggs into the pan being careful not to break the yolk. Cook until the whites firm up, then add 1 to 2 tablespoons of water around the edge of the pan and cover with a lid until the egg whites are firm, about 1 to 2 minutes more.
While the eggs are cooking, place a tostada shell on a foil lined baking sheet. Top with cheese and cover with another tostada. Repeat for more portions. Bake in a 350 degree oven until the cheese is melted.
Spoon some of the salsa verde onto the tostada, top with eggs, chorizo, more salsa verde, hot sauce (if using), tomato, onion, cilantro, and sour cream.
Serve with cherries on the side.