Costata Romanesco squash, also known as Romanesco zucchini or Italian zucchini, is a variety characterized by its distinct ribbed and slightly bumpy texture. It typically has a dark green skin with pale green stripes and a firm, creamy white flesh. This heirloom squash is prized for its nutty flavor and tender texture, making it ideal for grilling, sautéing, or using in various culinary dishes.