COOK fettuccine according to package directions.
MEANWHILE, MELT butter in large skillet on medium low heat. Add onions; cook until lightly golden about 3 minutes. Add ground pork; cook on medium heat stirring constantly, until no longer pink; drain. Stir in asparagus tips. Season with salt and pepper. Add wine; bring to a boil and cook, stirring occasionally, for about 10 minutes to reduce. Reduce heat to low; add evaporated milk. Simmer, stirring occasionally, for about 5 minutes.
COMBINE pork and asparagus sauce with drained fettuccine. Serve immediately sprinkled with a little queso fresco and parsley, if desired. Remaining cheese can be served along with pasta and sauce.