Ingredients:
- 8 oz Digestive Biscuits
- 3 Tbsp Granulated Sugar
- 6 Tbsp Unsalted Butter, melted
- 1/4 tsp Salt
- 4 Large Egg Yolks
- 14 oz can Sweetened Condensed Milk
- 1/2 cup Fresh Key Lime Juice
- 1 Tbsp Key Lime Zest, finely grated
- 1 cup Cold Double Cream (or Heavy Whipping Cream)
- 2 Tbsp Icing Sugar
- 1/2 tsp Vanilla Extract
- Extra Lime Zest (for garnish)
Instructions:
- Preheat the oven to 175°C (350°F). Lightly grease a 9-inch (23 cm) pie dish.
- Crush the digestive biscuits into fine crumbs using a food processor or by hand. Combine the crumbs, sugar, and pinch of salt in a bowl. Pour in the melted butter and mix until the mixture resembles wet sand.
- Press the crumb mixture firmly and evenly into the bottom and up the sides of the pie dish. Bake the crust for 8-10 minutes until lightly golden. Remove and allow to cool completely on a wire rack.
- While the crust cools, prepare the filling. Whisk the egg yolks in a large bowl on high speed until they become pale yellow and slightly thickened (about 2 minutes). Slowly pour the sweetened condensed milk into the yolks while mixing on low speed until fully incorporated.
- Reduce the mixer speed to low. Add the fresh Key lime juice and the zest. Mix only until the mixture thickens slightly—this should happen almost immediately. Do not overmix.
- Pour the filling into the cooled crust. Place the pie back into the preheated oven for just 5-8 minutes. The edges should be set, but the center should remain slightly wobbly. This brief bake stabilizes the filling.
- Remove the pie from the oven and cool completely on the wire rack at room temperature (about 1 hour). Transfer the pie to the refrigerator and chill for a minimum of 4 hours, or preferably overnight, until the filling is firm and completely set.
- Just before serving, whip the cold double cream, icing sugar, and vanilla extract until stiff peaks form. Slice the pie and top each slice generously with the whipped cream and a sprinkle of extra lime zest for garnish.