# How-To Steps:
01 - Halve six large lemons lengthwise. Gently juice and scoop out the flesh, preserving the shells intact. Trim a thin slice from the bottom of each shell so they stand upright. Refrigerate the shells until needed.
02 - In a medium saucepan, combine heavy cream, caster sugar, and lemon zest. Heat over medium until it reaches a gentle boil, stirring to dissolve sugar. Simmer carefully for three minutes, avoiding a rolling boil, then remove from heat.
03 - Stir in freshly squeezed lemon juice, allowing the mixture to thicken slightly. Let cool for ten minutes before straining to remove zest for a smooth texture.
04 - Carefully pour the cream mixture into the prepared lemon shells, filling near the rim.
05 - Place filled shells in the refrigerator for a minimum of three hours to set.
06 - Just before serving, evenly sprinkle about one teaspoon of caster sugar atop each posset. Using a kitchen blowtorch, caramelize the sugar until crisp. Allow sugar to harden for two to three minutes prior to serving.