Cream butter and sugar for 3-5 minutes until it becomes creamy and pale then add eggs, one at a time. Do not over beat. Fold in vanilla
Sift in flour & salt & baking powder then add lime zest and fold just until well combined with the help of a Rubber spatula
Fill Loaf pan tin until ⅔
Bake for 40 min or until skewer inserted comes out clean
Syrup
Towards the end of the baking time make the syrup: boil lime juice , sugar and mint leaves in a saucepan until slightly thickens and reaches syrup consistency. This will take about 3-5 minutes. Once syrup is ready, add rum in
Once loaf is baked, prick the top with a toothpick or skewer and pour the warm syrup over, this is the drizzle stage. The syrup will sink in. Let the cake cool in the tin in the fridge
After loaf cooled, carefully remove from tin
Chocolate glaze
Place finely chopped chocolate into a bowl, melt in microwave stirring every 30 seconds. When chocolate is melted (temp reached about 45C) mix in oil, heat the mixture up again to 45C then cool it down to about 27C by stirring
Optionally stir in zest of 1 lime and hand blend few mint leaves into the chocolate
Pour chocolate glaze (27C) over the chilled cake (5C), pop it back to the fridge for a minute, the glaze will set quickly