Roscher (Nektar and Ambrosia, 1883; see also his article in Roscher's Lexikon der Mythologic) nectar and ambrosia were originally only different forms of the same substance - honey, regarded as a dew, like manna, fallen from heaven, which was used both as food and drink.
Xvi.) P's version of the sending of the manna and quails.
This kind of manna seems to be alluded to by Herodotus (vii.
It is collected before sunrise, by shaking the grains of manna on to linen cloths spread out beneath the trees, or by dipping the small branches in hot water and evaporating the solution thus obtained.