Vivian reclaims root vegetables as comfort food icons. With Vivian reclaims root vegetables as comfort food icons. With nutritionist Christine Byrne, she browses Walmart's produce aisle, nutritionist Christine Byrne, she browses Walmart's produce aisle, exploring roots' colors and health benefits. She visits a lab where exploring roots' colors and health benefits. She visits a lab where chef Jenny Brule develops instant sweet potatoes, then heads to her chef Jenny Brule develops instant sweet potatoes, then heads to her church kitchen to elevate hummus with raw beet relish and wow meat church kitchen to elevate hummus with raw beet relish and wow meat lovers with a decadent multi-root gratin. lovers with a decadent multi-root gratin.