Preheat the oven to 350℉. Grease and flour a 10-cup Bundt cake pan and set it aside.
Sift all dry ingredients in one bowl and set aside.
2½ cups All-purpose flour, 2 teaspoon Baking powder, ½ teaspoon Salt
Massage the sugar and the lemon zest with your fingertips to release the aroma and oil from the lemon zest. Beat the butter and the sugar for at least three minutes. Scrape the bowl as necessary. This step is important and contributes to the fluffy texture.
1¾ cups Sugar, 1 tablespoon Lemon zest, 1 cup Butter
Add the eggs one at a time and mix after each one.
3 Eggs
Add the lemon juice and vanilla extract and mix well.
1 tablespoon Vanilla extract, 1 tablespoon Lemon zest
Add ⅓ of the flour to the mixture and fold it into the batter using a spatula. Add half of the buttermilk and mix, then add half of the remaining flour followed by buttermilk. Finish this step by adding the remaining flour.
¾ cup Buttermilk
Toss the berries in two tablespoon flour and ensure all the berries are coated with flour.
3 cups Mixed berries, 2 tablespoon Flour