Caramelize onions in olive oil
Season ground beef with salt, pepper, garlic powder, and onion powder
Brown the seasoned ground beef
Mix together light mayo, ketchup, mustard, relish, and white vinegar to make animal-style sauce
Brush butter on baking sheet
Layer tortillas, beef, cheese, and onions on the prepared baking sheet
Brush the mixture with animal-style sauce
Fold tortillas over
Cover with another pan
Bake at 450°F for 15-20 minutes
Cut and serve with lettuce, tomatoes, pickles, and remaining sauce
