Answer:
Manna appeared on the ground with the evaporation of a layer of dew that developed in the morning, so that "upon the surface of the wilderness there was a fine flaky thing, fine like hoarfrost upon the earth."
Manna was "white like coriander seed" and had the "look" of bdellium gum, a waxlike and transparent substance having a form that resembles a pearl. Its taste was comparable to "that of flat cakes with honey" or "an oiled sweet cake." After being ground in a hand mill or pounded in a mortar, manna was boiled or made into cakes and baked.
The psalmist referred to manna as "the grain of heaven" .