Question:

I cut an onion with a fleishig knife and put it into a parave blender.
Is the blender still parave?
Thank you

Answer:

There is controversy about this, and many poskim say that there is no need to kasher it. It is however a preference to kasher the actual blade, by inserting it into a pot of boiling water.

Best wishes

Sources:

Magen  Avrohom O:CH 451-31, Chochmas Adom 49-10, M:B 451-90,  Even Haozer Y:D 96-3, Badei Hashulchan  96-56, Davar Chorif 4-2,  HIlchis Basar Bchalav 10 ftnt. 5  from R’ N. Karelitz zt”l and R. E. Auerbach, and R’ Veber shlita.

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