Hmmm you need to explore more the game
Meadows/black forest food that gives much more stamina than hp :
Honey , raspberries , yellow mushrooms , blue berries , queens jam , carrot soup
In the swamp : muckshake and turnip soup

The farm system is about replant a verdure and you will get 3 seeds from only 1 carrot , u are asking to be 1 seed = 3 carrots ?
And yeap , worths a lot getting a 2 stars boar and later a 2 star wolf to farm them , 0 star boars are the only that have 50% to drop meat