People are eating up Walmart’s custom cakes. Here’s why they’re so popular

Inside a Walmart store in New Jersey, a worker puts the finishing touches on a cake with an edible ink Sponge Bob on top. A colleague creates a buttercream rosette border for a different cake, while another coworker frosts a tier of what will be a triple-deck dessert.It’s graduation season, the busiest time of year for the 6,200 employees the nation’s largest retailer trained to hand-decorate cakes per customers’ orders. The cakes themselves come, pre-made, frozen and in a variety of shapes...