Does any body know what Makhana is?

It is the puffed kernel of the Gorgon Nut or the Fox Nut. It is a flowering plant classified in the water lily family, Nymphaeaceae, although it is occasionally regarded as a distinct family Euryalaceae.

Seeds are often roasted or fried, which causes them to pop like popcorn. These are then eaten, often with a sprinkling of oil and spices. In Mithila culture of Bihar, India, the makhana is an auspicious ingredient in offerings to the Lord during festivals and is used in cooking, specially to make a porridge/pudding called kheer of makhana or 'makhane ki kheer'.