Sauté celery, onion and apple in butter. Add the cooked rice, meat, mayonnaise and seasoning salt. Spread the tortillas with the mixture and roll like a jelly roll. Cut into bite size pieces. Place cut end up on a baking sheet. Drizzle each piece with melted butter. Bake at 375 degrees for 10-12 minutes or until lightly browned. Serve immediately. Makes approximately 48 appetizers.