Almost 100 % Muslims make Talbinah with milk, because they were told & trained to do so.
But you will be surprised that this method is not correct.
Probably the oldest book on Tibb-e-Nabawi was written by Abdul Malik Bin Habib (died 238th year of Hijrah). For Talbinah, he wrote :
التلبين وهو أرق من الحريرة يعجن الدقيق، ثم يحلل بالماء، ثم يطبخ فإذا طبخ صفه فذلك التلبين
Talbeen is lighter than Harirah*, it is prepared in the following way:
* Harirah was a traditional soup that originated in Andalusia, typically made with barley or wheat, mutton, lentils, and other ingredients.
This explains that milk is never necessary to make Talbinah & Allah Knows the best, making Talbinah with milk can be an option, but milk is never compulsory.
TALBINAH is simply whole barley flour & water, & to enhance the taste, we make Talbinah with SAWEEQ/Sattu (roasted barley flour).
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