Great response by Bhai Kulbir Singh jee.
The author of that post has probably never spoken with Sarblohi Singhs about Sarbloh Bibek and does not seem like he wants to understand why Gursikhs keep this rehit. This post is just a show of their pure hatred towards Sarbloh and total ignorance of Gurmat.
I would like to address Sarvan Singh's point about the milk not being from a Sarblohi cow. This argument is nothing new and has been refuted by Gursikhs countless times. If the "baba" who came to Sarvan Singh's house was actually a Sarblohi Gursikh upon being asked why the milk is okay once put in Sarbloh, he would have dispelled Sarvan Singh's doubts and this post would have never come along. But Sarvan Singh didn't even want to know why this milk is okay once in Sarblohi bartan. He just wanted a fight. Sarvan Singh is devoid of Gurmat-Prema-Bhagti, and that is why he is so full of Krodh.
Raw ingredients once in the hands of Tyar-bar-Tyar Gursikhs can be used for cooking because in the process of cooking using Sarbloh bartan and Naam Gurbani, the food becomes pavitar and full of Amrit Ras. Milk, although having been touched by Manmukhs prior to coming to the hands of a Gursikh, is still a raw ingredient and once it is boiled in Sarbloh, it gets the Mor(insignia) of Khalsa. This milk then becomes pavitar and can then be consumed by Tyar-bar-Tyar Gursikhs without any problem.
But wait, I almost forgot, Sarvan Singh doesn't believe in the power of naam. So we are then stuck again at level one. Guru Sahib bhala karan ehna da.
Preetam Singh