R Abadi’s Rov

I noticed that the RAbbi quotes in many of his tshuvot things he saw by his Rebbi, I wanted to ask who does the Rov mean ? Is it r Aron?

Reb Aaron Kotler of Lakewood

May one buy a latte at any Starbucks if the milk is kosher or is there a concern being that it was washed together with treif and one is requesting from them to froth the milk if it’s permitted can you please explain the reason thank you

We are not concerned about the washing.

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