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Key lime tart

  • Preparation Time25 mins
  • Cooking Time18 mins
  • DifficultyMedium

For the digestive biscuit crust

150g digestive biscuits
85g unsalted butter, melted
75g sugar

For the filling

3 egg yolks
2 tsp lime zest
400g sweetened condensed milk
170ml freshly squeezed Key lime juice, or store bought

For the topping

250ml double cream, chilled
2 tbsp icing sugar
For the digestive biscuit crust:

1) Preheat the oven to 180C/Gas 4. Break up the Graham crackers, place in a food processor and process to crumbs. If you don't have a food processor, place the crackers in a large plastic bag, seal and then crush the crackers with a rolling pin.

2) Add the melted butter and sugar and pulse or stir until combined. Press the mixture into the bottom and side of a tart tin, forming a neat border around the edge. Bake the crust until it is set and golden, about 8 minutes. Set aside on a wire rack; leave the oven on.

For the filling:

1) While the pastry is baking, in an electric mixer with the wire whisk attachment, beat the egg yolks and lime zest at high speed until very fluffy, about 5 minutes. Gradually add the condensed milk and continue to beat until thick, 3 or 4 minutes longer. Lower the mixer speed and slowly add the lime juice, mixing until just combined, no longer.

2) Pour the mixture into the tart case. Bake for 10 minutes, or until the filling has just set. Cool on a wire rack then refrigerate. Freeze for 15 to 20 minutes before serving.

Topping:

Whip the cream and the icing sugar until nearly stiff. Cut the tart into wedges and serve very cold, topping each wedge with a large dollop of whipped cream.

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