Mayonnaise in a cake? This vintage baking hack is celebrating a comeback

Let's face it: who wouldn't do a double-take if they'd see mayonnaise listed as an ingredient in cake batter? It just doesn't sound like it could possibly taste good. Still, it's worth taking a second look. As strange as it may seem, this baking trick isn't exactly new: as far back as the 1920s, American home bakers have been using the creamy condiment as a secret ingredient for ultra-moist cakes. The first known recipe appeared in a Californian newspaper in 1927.