In a large skillet over medium heat, sauté ground meat, breaking up meat with a spoon, until meat is browned and no longer pink, about 12 minutes. Season with seasoning salt and pepper to taste. Drain off excess fat.
To build tacos, divide meat equally among tortillas. Top with blue cheese, Red Onion Salsa and lettuce. Fold tortillas in half. Note: Tortillas maybe warmed in a hot skillet stovetop.).
To Make Red Onion Salsa: In a large bowl, combine red onion, onion, lemon juice, lime juice, oil and parsley (or cilantro). Transfer to an airtight container and refrigerate, stirring occasionally, for 1 hour or for up to 24 hours.