In a large pot over high heat, boil the sugar and water until syrupy, about 30 minutes. Cool and transfer to an airtight container. Chill for 5-6 hours until cold.
Use a blender or food processor to blend the frozen watermelon, strawberries, lime juice and honey until smooth. Pour in the simple syrup and pulse until blended.
OPTION #1:
Use an ice cream maker to freeze the sorbet until it is thick and smooth. Transfer to an airtight container and store in the freezer. Enjoy!
OPTION #2:
Pour into an airtight container and freeze 8-10 hours. Store in freezer. Enjoy!