It's in the mastered tab. But it only makes three potions then ignores the four berries I have left and says I don't have any. Each time I re open the potion making screen the four berries are still in the inventory.
I'm playing on the Android version. Maybe I need to try the pc version instead, as the Android version is broken and won't let me finish the tutorial or skip it. Skipping just says "skipping" in the top left corner but nothing happens.