Coriander in a blueberry ice-cream?
If you add coriander, it should be because you agree with Mr. Weeks's assertion that it has a particular affinity with blueberry. Freshly ground coriander has a vibrant citrusy aroma, and (though I haven't tried it), I can see how it would go well in blueberry ice cream. I've found that sometimes a single flavor can be a little monotonous, and the coriander can bring some fun to the party. Give it a shot and see what you think.