How do you unlock the Trail Mix recipe in Fields of Mistria?

Trail Mix — Recipe Unlock: Starter recipe, known from the beginning of the game..

Trail Mix

Restores 12 Health and 12 Stamina

A pocket-sized mix of water chestnuts and wild berries for quick energy on the trail.

Ingredients	Water Chestnut × 2 Wild Berries × 1
Recipe Unlock	Starter recipe, known from the beginning of the game.
Effect	Restores 12 Health and 12 Stamina
Sell Price	12

Requires cooking level 1. Made entirely from free forage, so it is a zero-cost stamina top-up for long mining runs even though it sells for only 12t.