Passage: Tyrion, weary and drunk, is broken out of the crate in which he was smuggled out of Westeros by Varys. Arriving in Pentos, Varys tells Tyrion that he and Illyrio Mopatis had worked together in secret to install Daenerys Targaryen as the new ruler of Westeros, and convinces Tyrion to travel with him to Meereen to meet her.

Question: Where did Varys tell Tyrion about what he did with Mopatis?
Pentos