After the question of whether they should go into Mordor, Gandalf announced he had something - or rather some-place - to show Pippin and Merry.
Gandalf has led you to Bâr Thorenion in North Ithilien, cut into a high place above Cormallen.
You should talk to Gandalf to hear more about Bâr Thorenion.
Gandalf has invited everyone to step in and see Bâr Thorenion. You should talk to Merry and Pippin and hear what they think of it all.
Explore Bâr Thorenion with Merry and Pippin.
Talk to Pippin in the central courtyard, now that you have all explored Bâr Thorenion.
Help Pippin and Merry gather the things needed for a makeshift meal.
You should bring the things you collected to the table.
Join Merry and Pippin in enjoying the makeshift meal.