Biscuits (180g): Place 180 grams of plain biscuits on a clean surface and crush them into fine crumbs.
Butter (50g): Measure out 50 grams of butter and gently melt it over low heat until fully liquefied.
Combine the crushed biscuits with the melted butter in a bowl, stirring until the crumbs are evenly coated.
Transfer the mixture into a cake pan and press it down firmly with a glass to form a flat, compact base.
Place the pan in the fridge to set while you prepare the filling.