Love me some "stone soup"

In the village, under the shade tree, three sadhus sat around a small fire boiling water in a pot.
Villagers watched as each sadhu unwrapped a small packet revealing a smooth stone, perfectly palm sized and, like any good worry stone, polished to a shine.

The sadhus had no worries. They placed the three stones in the pot.
When asked what they were doing, they replied, "Making stone soup" and sat silently, simply stirring.
Word spread and more astonished visitors gathered to watch.

One sadhu said, "You know, an onion would be a great addition, considering the heat."
Said another, "Yes, and turmeric and sal ..." but the third interrupted with, "Remember the potatoes in the previous village?"
The sadhus sat and stirred and villagers came and went home and returned, and long after the sadhus left, everyone agreed it was the best 'stone soup' they'd ever had.