Pour the 2 cups heavy cream and 1 cup sugar into a heavy-bottomed saucepan over medium heat. Stir gently until the sugar completely dissolves, about 3-4 minutes. I always resist the urge to rush this step because undissolved sugar creates a grainy texture that ruins the entire experience—patience here is non-negotiable. Watch for small steam wisps rising from the surface as your signal to move forward.

Increase heat slightly and bring the cream mixture to a gentle rolling boil. Let it bubble steadily for exactly 2 minutes, then immediately remove from heat. This brief boil is crucial because it ensures the cream reaches the perfect consistency for thickening. Don't skip this timing—I once reduced it to 90 seconds and ended up with runny posset that disappointed everyone at dinner.

Whisk the 2 tablespoons fresh lemon juice into a small bowl with the 1 teaspoon lemon zest and 1/4 teaspoon salt. Let this mixture sit for 30 seconds so the zest releases its oils. The acid in lemon juice is what actually thickens the cream through a gentle chemical reaction—this is the magic moment where science becomes dessert. Stir this lemon mixture slowly into the hot cream, watching as it transforms before your eyes into something silky and thick.

Let the mixture cool at room temperature for 10 minutes, then fold in the 1 tablespoon butter, 2 tablespoons honey, 1 teaspoon orange blossom water, and 1/2 teaspoon ground cardamom. Fold gently rather than whisking to maintain the texture you've worked to achieve. These warm elegant spices are what make this lemon posset cozy dessert sing—don't skip them thinking they're optional garnish. Taste carefully and adjust cardamom if needed because everyone's spice tolerance differs.

Prepare 6 serving glasses or small bowls. Divide the mixture evenly among them, filling each glass about three-quarters full. Refrigerate for at least 4 hours, ideally overnight, until fully set and chilled. I always cover mine with plastic wrap because uncovered possets absorb refrigerator flavors—learned that the hard way with garlic-scented lemon dessert.

While the lemon posset cozy dessert chills, prepare a simple garnish by toasting 1/2 teaspoon ground cardamom in a dry skillet over low heat for 30 seconds. Mix with 1 tablespoon chopped mint leaves and set aside. This garnish adds visual appeal and a final aromatic hit that reminds people why they fell in love with this dessert.