Buttermilk Lemon Poppy Seed Cake
A tender, citrus-kissed butter cake with nutty poppy seeds and tangy buttermilk. Bright lemon juice cuts through the sweetness while the crumb stays moist and delicate. Perfect for afternoon tea, brunch, or a simple dessert that feels homemade and unrushed. This version relies on the classic creaming method to build structure, ensuring a fine crumb without fussy techniques.
Ingredients
- 1 ½ cup all-purpose flour, siftedcake flour0.9:1gluten-free compatible
finer crumb
- ½ tsp baking powder
- ½ tsp baking soda
- ½ tsp salt
- 1 tsp poppy seedssesame seeds1:1nut-freeseed
different nutty note
- 8 Tbsp butter, softened to room temperature
- 1 cup sugar, granulated
- 1 egg, large
- 2 tsp vanilla extract, pure
- 1 cup buttermilk
- lemon juice, from 1 fresh lemon
Instructions
- 1
Preheat oven to 350F. Spray 9-inch round pan with cooking spray and line bottom with parchment.
- 2
Whisk together flour, baking powder, baking soda, salt, and poppy seeds.
- 3
Cream softened butter and sugar in stand mixer with paddle attachment until fluffy.
- 4
Add egg and vanilla, mix until combined.
- 5
Add half the flour mixture on low speed, then buttermilk and lemon juice, then remaining flour, scraping bowl after each addition.
- 6
Pour batter into prepared pan and bake until cake tester inserted in center comes out clean, about 30 minutes.
- 7
Cool in pan for 20 minutes, then turn out onto wire rack to cool completely.
Tips
Cream butter and sugar for 3-4 minutes until pale and fluffy; this incorporates air for a tender crumb.
Alternate dry and wet ingredients, starting and ending with dry, to prevent overmixing and gluten development.
Use room-temperature ingredients for even mixing and a homogeneous batter.
Good to Know
Cover and store at room temperature up to 2 days, or refrigerate up to 4 days. Wrap tightly to prevent drying.
Batter can be mixed 2 hours before baking. Baked cake keeps well when cooled completely and wrapped.
Serve at room temperature with lightly sweetened whipped cream, tea, or coffee. Dust with confectioners' sugar if desired.
Common Mistakes
Do not skip sifting flour to avoid a dense, heavy crumb.
Do not overmix after adding flour to avoid tough gluten development.
Do not skip the cooling period in the pan to avoid crumbling when removed.
Substitutions
Dairy-Free Swaps
Gluten-Free Swaps
Nut-Free Alternatives
FAQ
Can I use fresh lemon zest instead of juice?
Yes, add 1 to 2 tsp zest to the butter-sugar mixture before creaming for bright flavor. Omit or reduce juice. Zest adds fragrance without extra liquid.
What if my cake sinks in the middle?
This usually means underbaking. Test with a cake tester; it should come out clean or with just a few crumbs, not wet batter. Oven temperature varies, so check at 25 minutes.
How long can I keep this cake, and can I freeze it?
Wrapped tightly, it keeps 2 days at room temperature or 4 days refrigerated. Cool completely, wrap in plastic, then foil, and freeze up to 3 months. Thaw at room temperature.