Transfer 1/4 cup of the sugar mixture to a small bowl and set it aside. Add butter to the remaining sugar mixture and beat until mixture is fluffy, about 2 minutes Add the eggs, one at a time, mixing after each addition just until combined. Add the egg yolk and mix to combine. Set mixer to low speed and add flour mixture in 3 additions alternating with buttermilk mixture. Mix until ingredients are just blended.
ButtermilkCake. In saucepan over medium heat, cook brown sugar, butter and lemon juice, stirring, until sugar is dissolved, about 2 minutes. 5 L) square cake pan. stir into butter mixture alternately with buttermilk, making 3 additions of dry ingredients and 2 of buttermilk. Bake in 350 degrees F (180 degrees C) oven until cake tester inserted in centre comes out clean, about 40 minutes
finely shredded lemon peel. Honey Buttermilk Oatmeal Coffee Cake. •Baking soda (an alkaline salt, sodium bicarbonate) is used when the liquid is acidic, such as buttermilk, honey, molasses, tomato sauce etc