Dessert

Preheat the oven to 325°F.
Whizz the biscuits to fine crumbs, melt the butter and mix until combined
Press the crumb mixture into the base and up the sides of a 22cm loose-based tart tin, bake for 10 minutes and cool
Whisk the egg yolks with electric beaters until pale (about 1 minute)
Add the condensed milk and whisk for 3 minutes
Add the lime zest and juice and whisk for 3 minutes
Pour the filling into the cooled base, bake for 15 minutes, then cool and chill for at least 3 hours
Carefully remove the pie from the tin and transfer to a serving plate
Softly whip the cream with the icing sugar until soft peaks form
Dollop or pipe the whipped cream onto the pie and finish with extra lime zest