1. Catch a Hylian Bass in the water near the first tower.
2. Go to the forest and shoot a boar for some fresh meat.
3. Hot peppers can be found near the gate to the icy frozen area.
Combine these three ingredients into a dish for the Old Man, then give it to him. He will give you the doublet in return.
Don’t know how to cook in Zelda? Here’s how to cook in Zelda.