So one things that often comes up with characters just leaving the 'spruce cap' stage of character development is needing lots of energy but not wating to gain FEPs in stats they don't need as well as not wanting to lower satiations that they DO need.
The Spindly Taproot grants 100 energy only filling 1 hunger and satiates nothing and gives no fep.
I think that hearthlings should be able to use a boiling caldron to extract the enegry restoring properties from tap roots.
5 spindly taproots, .5 liters of water, stored in a clay jar gives you Energy Supplement which can be 'eaten' for 750-1,000 energy only 1 hunger, no satiation and no FEPs. Whatever we think is balanced. A Hearthling would need the Plant Lore to know how to do this.