Cardamom Citrus Coffee Cake

Katie Goodman at Good Life Eats shares her recipe for this cardamom citrus coffee cake.
Katie writes:

What does cardamom taste like? It is described as having a strong, unique spicy-sweet taste, which is slightly aromatic (from RecipeZaar). What flavors go well with cardamom? It is common in Indian cooking and is said to match well with chicken, cinnamon, coffee, coriander, dates, curries, ginger, oranges, rice, and tea.