01 -
Preheat the oven to 375°F (190°C).
02 -
In a roasting dish, arrange plums cut side up in a single layer. Add sugar, lemon juice, crushed cardamom pods, and vanilla bean with seeds. Bake for 30 minutes, until plums are tender. Remove from oven and let cool completely.
03 -
Remove pits from plums and discard all solid spices. Reserve all juices and plum flesh.
04 -
Combine water, sugar, and crushed cardamom pods in a small saucepan over medium-high heat. Bring to a boil, stirring occasionally until sugar has completely dissolved.
05 -
Remove the pan from heat and let the cardamom steep in the syrup for 10 minutes to infuse the flavor. Strain the syrup to remove cardamom pods.
06 -
In a high-speed blender, combine roasted plums with their juices and the cardamom syrup. Purée until completely smooth. Strain the mixture through a fine-mesh sieve to remove any solids.
07 -
Transfer the strained mixture to an airtight container and refrigerate for at least 2 hours until thoroughly chilled.
08 -
Pour the chilled mixture into an ice cream maker and churn according to manufacturer's instructions until frozen to a sorbet consistency.
09 -
Transfer the churned sorbet to an airtight container and freeze for at least 6 hours or overnight to set completely.
10 -
Scoop the sorbet into serving bowls. If desired, garnish with fresh sliced plums.