When In Hot Water I Get Harder. I Am Only Useful Once Broken

Riddle: When in hot water I get harder. I am only useful once broken. Some people eat only the white part for its low fat, high protein nutritional content. What am I?

Answer: I am an egg.

Source: https://www.riddles.com/7562

When in hot water I get harder. I am only useful once broken. Some people eat only the white part for its low fat, high protein nutritional content. What am I? — When in hot water I get harder. I am only useful once broken by David Powell v1.

Riddle: When in hot water I get harder. I am only useful once broken. Some people eat only the white part for its low fat, high protein nutritional content. What am I? Answer: I am an egg. — by David Powell v2.