There's plenty of room for experimentation here. We've used grilled eggplant, zucchini, bell peppers, and onion sandwiched in crusty rolls with a little pesto. Fennel, endive, or mushrooms would make fine vegetable substitutes; sun-dried tomatoes or white-bean puree can replace the pesto; or omit the condiment altogether and top the sandwich with whole fresh basil or mint leaves. You can even change the cooking equipment, using the broiler or a grill pan in lieu of an outdoor grill. More Sandwich Recipes
Slice zucchini lengthwise for grilling, so that you won't have to contend with all those little rounds of squash threatening to fall through the grate.
Alsace Pinot Blancs are among the most versatile of wines. Soft, nutty, and easy to drink, they partner vegetables, chicken, and fish equally well. And most appropriately for this unpretentious sandwich, they are always inexpensive.