This may be the most cheerful salad my table has seen all summer. With golden shades of the season’s vegetables, it features roasted peppers, tiny sweet tomatoes, and grilled squash and corn. Dressed with vinaigrette and served with herbed ricotta, it’s bright in flavor and beautiful to serve. While the vegetables are monochromatic, their textures and flavors are anything but similar. Even the squash and corn, both cooked on a grill or in a grill pan, respond differently to the same application of heat. Where the squash softens, the corn becomes crisp-tender. The yellow peppers are roasted until their skins char and are removed before being sliced into ribbony pieces.…