Sausage and Vidalia Onion Casserole

The story goes that when a Toombs County, Georgia, farmer named Moses Coleman planted some Bermuda onion seeds in the sandy loam around Vidalia in the spring of 1931, the onions he harvested were not just mild in aroma but “sweet as Coca-Cola.” The reason, it was later discovered, was the low sulfur content of the region’s soil. Today, coveted Vidalia onions, widely available only in May and June, are a thirty-million-dollar business in Georgia and protected under a registered trademark (Yu