01 - Gently peel the pears, ensuring the stems remain intact. Immediately rub the peeled surfaces with lemon juice to prevent discoloration.
02 - In a medium saucepan, combine the water, granulated sugar, split vanilla bean, and cinnamon stick. Bring the mixture to a gentle simmer over medium heat, stirring consistently until the sugar has completely dissolved. Carefully add the prepared pears to the poaching liquid. Poach gently for 15 to 20 minutes, periodically turning the pears, until they are tender when pierced but still hold their shape. Remove the pears from the syrup, allow them to drain thoroughly, and then cool completely.
03 - Set a heatproof bowl over a saucepan of simmering water (creating a double boiler), ensuring the bottom of the bowl does not touch the water. Add the chopped dark chocolate and unsalted butter to the bowl. Stir continuously until the chocolate and butter are fully melted and the mixture is smooth and glossy. Remove the bowl from the heat and allow the chocolate to cool slightly to a workable temperature.
04 - Holding each cooled pear by its stem, carefully dip it into the melted chocolate, swirling to ensure a complete and even coating. Lift the pear, allowing any excess chocolate to drip off. Place the chocolate-coated pears onto a baking tray lined with parchment paper. If desired, immediately sprinkle with your chosen garnishes before the chocolate begins to set.
05 - Transfer the tray of coated pears to the refrigerator and chill for at least 30 minutes, or until the chocolate coating is firm and fully set.
06 - For optimal texture and flavor, allow the chocolate-covered pears to sit at room temperature for approximately 10 minutes before serving.