Ratatouille of Grilled Vegetables

No less than meat and fish, vegetables are enhanced by the smoky perfume and radiant heat of the grill, whether served plain with a simple salsa verde or vinaigrette, stirred into a risotto, or combined into a grilled version of a vegetable stew such as ratatouille or peperonata. Grilled potatoes can be made into an intriguing potato salad that is even tastier when it includes a few grilled scallions. Different vegetables require different grilling approaches, and some vegetables can be grilled in more than one way. In general, grill vegetables over a medium to medium-hot bed of coals; a hotter fire will scorch the vegetables before they cook through. Conveniently, the fire is often at the perfect temperature for vegetables after the meat or fish has been grilled. You can also distribute the coals to create areas with different temperatures, so that one area burns hot while the other is medium-hot, allowing you to grill vegetables at the same time as a steak, for example. Use the hand test. If the fire is medium-hot, you should be able to hold your hand over the grill for about 4 seconds. Clean the grill well and oil it after it has heated up, before putting the vegetables on. Summer squash, eggplant, potatoes, and onions should be sliced 1/4 inch to 1/2 inch thick, as uniform as possible. Cut peppers in half or in quarters and clean out the ribs and seeds. Onion slices can be skewered flat, which makes them easier to turn. (Soak skewers in water for a few minutes to keep them from igniting.) Salt the vegetables. This can be done ahead of time, but note that salting accelerates moisture loss, so don’t be alarmed by liquid around them when you’re ready to grill. Brush olive oil generously over the vegetables before grilling. They can also be tossed with chopped herbs. After the vegetable slices have been on the grill for a few minutes, rotate them a little over 90 degrees to make a nice crosshatch of grill marks. After a couple more minutes turn the vegetables and finish cooking, rotating them once more to make grill marks, and turning them again, if necessary. Take the slices off the grill as soon as they are tender. Check for doneness at the stem end, which always takes the longest to cook. (Again, tongs are my favorite grilling tool; they make turning the vegetables a breeze.) Leafy vegetables such as scallions, small leeks, and wedges of radicchio benefit from an initial moistening before they go on the grill. Oil them, and then sprinkle them with water or mist them with a spray bottle. Turn them often as they grill to prevent scorching, and keep sprinkling or misting them to keep them moist. To accelerate their cooking, invert a metal bowl over them, to steam them while they grill. Some vegetables are better when cooked until tender in boiling water before being finished on the grill: asparagus, for example, and leeks that are larger than scallions, and small artichokes and potatoes, whole or halved. For easy turning on the grill, skewer potatoes and artichokes, taking care that all the cut faces are on the same plane when skewered to ensure equal contact with the grill. Tomatoes can be grilled, but they need a hot fire. Cut them in half and slide them onto the grill, cut side down. Let them grill for 3 minutes to seal the flesh before trying to rotate them. Be sure to clean the grill before you grill anything else, as tomatoes are a bit messy. Vegetables such as eggplants, summer squashes, and peppers can be cooked whole, but because they will take longer to cook through, the fire should be medium rather than medium-hot. Make a couple of deep incisions in their sides to speed up the cooking and to keep them from bursting from a buildup of steam. Corn can be grilled with great success after a little preparation. Peel back the husks, leaving them connected at the base of the ear, and remove all the silk. Season the corn with salt and pepper and a little chile or herbs, if you want; brush with some butter or o...