[header] How to make lolly cake [title] Crush the biscuits very finely. [step] Use a rolling pin for the best, faster results. [title] [substeps] Seal the whole biscuits in a baggie/plastic bag before placing it on a towel. 
Position a towel on top of the bag to prevent damaging it while crushing. Stop several times while crushing to check how the biscuits are going.