Needs to be fermented.
Full material breakdown in the crafting calculator →
10 Honey + 5 Blueberries + 10 Raspberries + 1 Dandelion → 1 Mead Base: Minor Healing
Unlocks once you have stood near a Mead Ketill of level 1 and picked up each of: Honey, Blueberries, Raspberries, Dandelion.