01 -
Turn oven on to 300°F (150°C). Prep a 10-inch tube pan by greasing it and sprinkling in flour, then line the base with parchment paper.
02 -
Using an electric mixer, beat sugar, softened butter, and shortening until it's light and airy.
03 -
In another bowl, sift cake flour with baking powder and salt to get it evenly mixed.
04 -
Add dry mixture, eggs, and heavy cream alternately into the butter blend, starting and ending with the dry mix. Use low speed and avoid overmixing.
05 -
Gently stir in Key lime juice, lime zest, and vanilla extract until it's just evenly mixed. Don't overdo it.
06 -
Spoon the batter into the pan, spreading it out in an even layer.
07 -
Slide the pan into the oven and bake for around 1 hour and 30 minutes, or until a toothpick poked in the middle comes out clean.
08 -
Leave it in the pan for 15 minutes before moving it to a wire rack to cool down completely.
09 -
Mix together powdered sugar, lime juice, and vanilla until smooth and runny.
10 -
Drizzle or spread the glaze over the completely cooled cake. Give it a minute to set before serving.