The inhabitants of the village brought to the Deity of Gopāla as much food grains, ghee, yogurt and milk as they had in their village. (Cc. Madhya 4, 93)
…We should understand that in order to prepare nutritious food, we require only grains, ghee, yogurt and milk.
..Anna, ghṛta, dadhi and dugdha are food grains, ghee, yogurt and milk. Actually these are the basis of all food. Vegetables and fruits are subsidiary. Hundreds and thousands of preparations can be made out of grains, vegetables, ghee, milk and yogurt.
…People are often frustrated with national food policies, but from the Vedic scriptures we find that if there are sufficient cows and grains, the entire food problem is solved.
…Cows are the most important animal because they produce the miracle food, milk, from which we can prepare ghee and yogurt. (from purport)
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The Hare Krishna Movement 