Thanks for the tips, Guayaba, I have one about 2m tall but not blooming yet!
Adam: " pick when there is a about 10% green coloration left, 90% yellow."
I grow many species and use to advice the people all the time about harvest time... many of the species I knew use to be good when they fall of the tree (feijoa, pitanga, uvaia, araza-una and others). It is very useful to know biribá should be a bit underripe to try it