The The Old Man's Diary is a book in the game The Legend of Zelda: Breath of the Wild.
Found on a wooden table inside a cabin in the Great Plateau.
(NOTE: For solution to the riddle, scroll to the bottom of the page)
A diary belonging to the Old Man
The old man's diary...
On this desolate plateau, the only pleasure that brings me comfort is cooking. And today, I outdid myself! Truly, I created the perfect dish. I call it... Spicy Meat and Seafood Fry.
This recipe not only restores health, but it also keeps me warm, even when traveling in the snowy mountains.
With this dish on my side, I no longer have need of that itchy Warm Doublet.
I do not know how I allowed this to happen, but it seems I forgot to write down a very important recipe. I know it contains raw meat and Spicy Pepper. However...
I simply cannot remember what else I used! My age is catching up to me. Sadly, on this lonely plateau, i have only my own memory to rely on. Still...
If I did find someone who knew the missing ingredient, I would happily reward them with my Warm Doublet.
However, it seems unlikely that such a miraculous wish will ever be fulfilled.
- Look around at the cabin you found this diary in; There are lots of cooking ingredients laying around including the spicy peppers needed for the recipe mentioned in the book.
- The missing ingredient is seafood, for example Hyrule Bass