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1
Cut butter into flour and salt until breadcrumb texture; add ice water and form disk.
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2
Chill dough 30 minutes; press into 23cm pie tin.
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3
Prick crust with fork; blind bake at 190°C for 12 minutes; cool slightly.
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4
Whisk egg yolks, condensed milk, key lime juice, and zest until smooth and homogeneous.
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5
Pour filling into crust; bake at 170°C for 15 minutes until slightly firm but center jigggles slightly.
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6
Cool to room temperature, then refrigerate minimum 120 minutes.
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7
Whip heavy cream with powdered sugar; dollop before service.