Heat the oil in a large skillet. Add the onion, and saute over medium heat until soft. Add the beef, using a fork to break it up into small bits. Cook until the redness is gone. Add the spinach, and mix well. Cook, stirring, for 3-4 minutes. Add salt to taste. Mmix the Tabasco with the eggs. Pour over the beef mixture, and cook, stirring until the eggs are set. Remove from heat, transfer to a warm platter and sprinkle with parmesan.