Is Starbucks Via better than brewed coffee regarding bishul?
My posek allowed it using irui kli sheini (which has a din of kli shlishi), but doesn’t allow tea bags in a kli shlishi. I didn’t ask him about pour over coffee, but I assume it’s the same as tea.
I believe the metzius of Via is different than regular coffee grounds.
It might also be different than other instant coffees, but even on that, irui kli sheini is recommended.