Start with 120 grams of melted butter and mix with the crumbs.
Add the remaining 10 g if needed. The mixture should hold together when squeezed, without feeling greasy.
Press the crumbs firmly and evenly across the bottom and up the sides, paying particular attention to the bottom edge where the base meets the sides. This helps prevent the crust from crumbling when you slice the pie.
Bake at 350°F (175°C) for 8–10 minutes.