Looking for Episode where Don eats ice- cream

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Hey there,

first- time poster here, and I hope I am doing this right... If this is incorrect, Mods, feel free to remove it and should that be the case, I apologize for the mistake...

My question is needed for a fic, but it is not actually about a fic...

Anyways, I am looking for the episode where Don eats ice cream... I have this image in my head where he is eating some and it is driving me crazy... If anybody could help me, I would be soooo grateful!