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.
His brother's smile curdled like sour milk. " Tyrion, my sweet brother, " he said darkly, " there are times when you give me cause to wonder whose side you are on. "
The mirth curdled on Robert's face. " The woman tried to forbid me to fight in the melee. She's sulking in the castle now, damn her. Your sister would never have shamed me like that. "
For at least the last 7,000 years, humans have extracted a mixture of enzymes from the stomachs of cows and sheep and goats and added it to milk. This causes the milk to curdle—it's part of the cheese-making process.