I will, however, pull out my food processor and the ice cream machine. Rev her up, Tilly, it's time to make a little magic.
In a small saucepot, add 1/4 cup sugar to 1/2 cup of water and !/4 cup of corn syrup (I'm wondering if honey would have been better for the flavor-?) Also, if you're berries are a little on the tart side, add a bit more sugar). Turn up the heat and stir until all the sugar is dissolved and boil for one minute. Set the pan aside to cool completely.
This is your sorbet base. AND, because it is already cooled, you can go ahead and run it in your ice cream machine (according to directions). When it's all chilly willy, freeze it up a bit for a firmer texture.
Now, blackberries are notoriously seedy (kinda like the side streets in Vegas....) so if you are really truely annoyed by them either (1)run the base through a fine-mesh sieve before running it or, (2) um, don't eat blackberries. yeah, that's all I got....
So now Thing 2 can eat her sorbet.