Tangerine-poppy seed chiffon cake

Up until a couple of weekends ago the only chiffon cakes I’d baked were layer cakes: they were delicious and perfect for birthday celebrations, but I wanted to make one of those tall, elegant chiffon cakes (baked in tube pans) I’d seen on some cookbooks and blogs. I chose this recipe because I love tangerines and the idea of a cake made with them sounded very refreshing, exactly what that very