Is Eating Balut Permissible?
Question

Belut is a fertilized duck or chicken egg that contains a nearly-developed embryo. This egg is boiled and eaten in the shell. The prevalent belief here in the Philippines is that it contains a high level of protein and is good for the heart. It is sold in the markets and streets of the Philippines. What is the ruling on eating this kind of egg?
Praise be to Allah.What is a balut egg?
The description of this egg on some websites is as follows: 
“Development of the chick usually takes 28 days, but balut is an egg that has been incubated for only 18 days, during which they get a real embryo with a primitive skeleton. 
When the egg reaches the age of 16-20 days, it is ready to be taken to market, where it will be boiled for thousands of customers who enjoy this food. This depends on the size of the egg. The egg that is 18 days old is the best. The sellers wash the eggs thoroughly with sponges, then when they are perfectly clean, they are put in a pot and boiled.” 
Is eating balut permissible?
With regard to the ruling on eating the egg with the embryo that is not fully developed, the ruling is that it is prohibited, because it comes under the heading of eating Maytah (something that has died without being slaughtered properly). Eating Maytah is definitely prohibited according to Islam. 
The scholars of the Standing Committee for Issuing Fatwas were asked about the ruling on eating this egg and they ruled that it is prohibited. 
They were asked: 
When we visited the Philippines, we noticed that the people of that country commonly eat a dish they call balut. This is a chicken egg that is placed in an incubator until it develops the form of a small chick with all its features. Three days before the egg is peeled, they cook the egg in water until it is done, then they break the egg and eat the chick that is inside it. 
Please advise us of the ruling on eating this food. 
They replied: 
“If the situation is as described, then the chick is regarded as Maytah and it is not permissible to eat it, because it had taken shape inside the egg, and the prohibition on Maytah is something that is well known and well established in Islam.”  (Shaykh `Abd Al-`Aziz Aal As-Shaykh, Shaykh `Abd-Allah ibn Ghadyan, Shaykh Salih al-Fawzan, Shaykh Bakr Abu Zayd, Fatawa al-Lajnah Ad-Da’imah, 22/305) 
For more details, please see the following answers: 149059 , 169813 , 142901 , and 148665 . 
And Allah knows best.