Grilling mushrooms can be a delicious and nutritious way to add variety to any grill-out. A few things to consider:

1. Larger mushrooms are better, as they are less likely to fall through the grills, and their added water mass makes them less likely to burn before cooking through. Try cooking portabella caps, or speciality mushrooms such as clumps of oyster mushrooms, sliced king oyster mushrooms, or other larger mushrooms that you can find at a local farmer's market.
2. Mushrooms have a porous structure and will readily accept oil and flavor. Try soaking them in a marinade for anywhere from 15 minutes to several hours before cooking them. A marinade can be made of ingredients like soy sauce, a flavorful oil, spices, herbs, fish sauce, sweetener such as maple syrup, or whatever you have on hand and tickles your fancy. 
3. Mushrooms can be cooked directly on the flame heat. In that case, you will want to use a medium-low flame, and allow the mushrooms to roast for a while. Mushrooms are made largely of chitin, and so unlike plants they do not go mushy as they cook, and they take much longer than meat to dry out and get tough. A well-done mushroom is a flavorful and pleasantly textured mushroom. If the outside appears to be drying out, don't be afraid to brush it with more marinade, or with something like butter to add flavor and hydration.
4. You can also wrap the mushrooms in foil, including some of the marinade, and cook them in the foil, steaming them. This will result in a softer, limper mushroom, but one that is almost buttery in its consistency. This is especially nice to do with larger bunches of smaller mushrooms, such as oyster mushrooms or enoki mushrooms.
5. Probably best of all, you could combine the above two methods: first steaming the mushrooms in a foil pouch, and then searing them on a high flame to get some char and smokey flavor.

I hope you enjoy your mushrooms. Don't be afraid to experiment with flavors for the marinade: butter and parsley, soy sauce and toasted sesame oil, chicken stock and truffle oil, the sky is the limit!
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