There really isn’t any type of produce that won’t benefit from being grilled! However, it’s important to note that some things will take less time to grill than others.
For example, romaine lettuce only needs to be grilled for a minute of two per side, while sweet potatoes need about 15 minutes of cooking time.
If you want dense vegetables to grill, look for ones like carrots, parsnips, beets, squash, sweet potatoes, potatoes, etc. that take a little longer to grill whole. If you want to cut them into 1/2 inch slabs, it’ll cook a little faster and yield some delicious browning thanks to their sugar content. For juicier vegetables, look for veggies like zucchini, peppers, tomatoes, mushrooms, eggplant, etc., which take less time to cook because they have a higher water content
For sweet caramelization, look for sweeter fruits and vegetables like watermelon, onion, pineapple, peaches, or even kiwi! The higher the sugar content in the fruit and vegetable, the more caramelization!