Grilled Vegetables with Three Marinades

My favorite vegetables on the grill are thick slices of red onion, eggplant, summer squash, and tomatoes. The simplest and most straightforward way to season vegetables for the grill is to toss them with a little olive oil, a drop or two of balsamic vinegar, and a sprinkling of kosher salt and freshly ground pepper. As with other cooking techniques, if you are preparing more than one kind, make sure they are of a variety and size that will cook in the same time. (And if you’re cutting them,