Lightly brush the interior of the pan with olive oil. Use a paper towel to remove any excess that may drip down into the bottom.
Lay grape leaves in a single overlapping layer around the bottom of the pan. Add a second and third layer, working up the sides of the pan, and hanging out the sides (and in the center opening).
Use leaves that are whole and without any damage for the bottom layer (which will show on the top); torn leaves can be used on the inner layers.
Preheat oven to 390°F (200°C).