Start by preheating your oven to 350°F (175°C). Grease one loaf pans and set them aside.
In a large mixing bowl, cream together the softened butter and 1 ½ cups sugar until light and fluffy.
Beat in the eggs one at a time. Add the lemon juice and vanilla extract, mixing well.
Gradually add the buttermilk, flour, and baking soda to the butter mixture. Mix until just combined.
In a small bowl, mix together ⅔ cup sugar and 2 teaspoons ground cinnamon.
Pour half of the batter into the prepared loaf pan. Sprinkle half of the cinnamon-sugar topping over the batter. Add the remaining batter on top and finish with the remaining cinnamon-sugar topping. Lightly and gently swirl the batter using a butter knife.
Bake in the preheated oven for about 1 hour and 20 minutes, or until a toothpick inserted into the center comes out clean.
Allow the bread to cool in the pans for about 15 minutes, then transfer to a wire rack to cool completely.
Notes
Tips
Room Temperature Ingredients: Ensure your butter and eggs are at room temperature for easier mixing and a better texture.
Avoid Overmixing: Mix the batter until just combined to prevent a dense texture.
Storage and Freezing
Keep the bread in an airtight container at room temperature for up to 3 days.
Wrap the bread tightly in plastic wrap and then in aluminum foil. Freeze for up to 3 months. To enjoy, thaw at room temperature or warm slices in the microwave.