1Chop green onions and parsley, zest the orange, and combine with breadcrumbs and ground pork rind to make the gremolata.
2Place rigatoni in a large saucepan, add enough cold water to cover by an inch, add salt, and bring to a simmer over medium-high heat, stirring often until al dente.
3Cook breakfast sausage in a skillet over medium-high heat until browned, then stir in sage, black pepper, and green onions.
4Whisk together eggs, grated pecorino romano, and black pepper.
5Transfer cooked pasta to the skillet with the sausage, add a little pasta water to combine, then remove from heat.
6Pour the egg mixture into the skillet and toss thoroughly with the pasta until creamy, adding more pasta water if necessary.
7Stir in about half of the gremolata mixture, then plate and garnish with the remaining gremolata.