My wife came up with the initial recipe. I've refined it over the last year. It is very good, very easy, and I've served it to numerous guests. If they like squash at all they liked this recipe.
Full recipe with pictures can be found at:
https://averysgameblog.wordpress.com/2019/05/15/grilled-zucchini-recipe/
In the SE USA at least, zucchini is exceptionally cheap in season and grows like a weed in gardens.