I bought a grill pan a few months ago and I absolutely love it! My husband and I aren’t fond of zucchini, but I would imagine you prepare it the same way you prepare most vegetables on a grill pan– oil/butter/margarine, spices, medium-high or high heat, turn often, watch it so it doesn’t burn. If you want, you can salt the zucchini beforehand and let it sit to release moisture.
I don’t have a cast iron skillet yet, although it is on my wish list. The grill pan that I use was $20 at TJ Maxx and worth every penny. I use it for basically everything, but my favorite thing to make in it is definitely grilled asparagus.
Made the zucchini and yellow squash on the grill pan tonight cut about a half inch or a little bigger marinated them in oil and spices for a couple hours put it on medium heat for about two minutes a side they were yummy!! now all i have to do is clean the pan any help there?