At the centre of the book is an unnamed Indian mother who makes dahi the traditional way, curdling each new pot of yogurt with a spoonful from the one before it.

故事的中心是一位无名的印度母亲，她用传统的方式制作家乡的酸奶，即从前一罐酸奶中取用一匙来发酵一罐新的酸奶。