Mango–Turmeric Chiffon Cake

My lola made this chiffon cake—akin to Taisan but layered with fresh, ultra-ripe mango, and a Red Ribbon Bakeshop classic—for many birthdays, in many shapes: sheets, rounds, dramatic tiers. My mom made it, too, and devoted serious time to decorating, drawing from a suitcase full of vintage piping tips and pillars. My version is humbler: I adorn it with nothing more than sunflower petals, a nod to my mom’s other great hobby, floral arranging. (Be sure to us