Wow, what an incredible discovery to find such a treasure on your property!
Your homemade apple sauce sounds absolutely delicious, especially with that touch of cinnamon.
It's amazing how you've nurtured the tree back to health, and it’s clearly rewarding you with a bountiful harvest. I bet those apples taste even better knowing they come from your very own mystery tree. Keep up the great work, and I hope you find out the cultivar one day... until then, enjoy all those tasty creations!