I was intrigued when I saw this recipe and found it really good! Be sure to use SWEET ONIONS for they are not overpowering like the storage onions. They become nice and chewy and very sweet when baked. Yes it's a heart-healthy cake making it a lovely dessert for Valentines days. Sweet onions, sometimes referred to as "short day" onions, because their growing season occurs during the fall and winter with harvest usually in spring /summer, are fresh onions, picked and cured for a short time, then sent to market. Unlike storage onions, are harvested in late summer and fall, stored in warehouses and delivered to markets throughout most of the year. The batter is yolk-less and is very light.