So this yajña... Formerly yajña was performed very gorgeously. So many mounds of ghee and grains were put into the fire. But in this age, Kali-yuga, there is neither ghee nor grains to offer in the fire, yajña fire. Therefore in this Kali-yuga the yajña is performed by chanting the holy name of the Lord.
Gorgeous (Lectures)
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Lectures
Bhagavad-gita As It Is Lectures
Formerly yajña was performed very gorgeously. So many mounds of ghee and grains were put into the fire.
Lecture on BG 3.14 -- Sanand, December 27, 1975: