Huevos con Chorizo

Name: Huevos con Chorizo
Ingredients: 2 plum tomatoes, diced; 1/2 jalapeno, diced (seeded if desired); 1/2 small red onion, diced; 1/2 cup fresh cilantro leaves, roughly chopped (reserve some for garnish); Juice of 1/2 lime; Kosher salt and freshly ground black pepper; 2 to 3 tablespoons vegetable oil; 1 pound fresh Mexican chorizo, casings removed; 1 small white onion, finely chopped; 8 large eggs; 1 tablespoon unsalted butter; Eight 6-inch flour tortillas, warmed, for serving; 2 avocados, peeled, pitted and sliced