Did they show for the first time Pia facing Pari?

I am not sure but I may have missed something. When Pari saw Pia she didn't show any expression of "who are you?" instead talked to her as if she already knew her as chef etc. How come? Did they already introduce them to each other and that is how Pari knows her? Did I miss something in a previous episode or what?

No I dont think you missed anything. I was thinking the same as you. I was confused too lol