Watermelon sorbet

Ingredients:

1 1/2 pounds watermelon, weighed without seeds or skin
1 1/4 cups granulated sugar
2 cinnamon sticks
2 tablespoons coriander seeds, crushed
3 tablespoons lemon juice

Preparation:

Reduce watermelon flesh to a puree. In a heavy-based saucepan, dissolve sugar in 2 cups water.
Add cinnamon sticks and coriander seeds and boil for 5 minutes. Cover and leave to infuse until cold.
Strain syrup into the watermelon purée and stir in lemon juice. Pour mixture into a container.
Cover and freeze until firm, beating 3 times at 45-minute intervals.
About 30 minutes before serving, transfer the sorbet to the refrigerator.