01 -
Preheat the oven to 350°F (175°C). Grease and flour a loaf pan (8×4 inches).
02 -
In a medium bowl, whisk together the flour, baking soda, baking powder, and salt.
03 -
In a separate large bowl, cream the butter and sugar together until light and fluffy. Add the egg, beating well after each addition.
04 -
Mix in the buttermilk, lemon zest, lemon juice, and vanilla extract. Gradually add the dry ingredients and stir until just combined.
05 -
Gently fold in the diced rhubarb until evenly distributed in the batter.
06 -
Pour the batter into the prepared loaf pan and smooth the top.
07 -
Bake for 55-65 minutes, or until a toothpick inserted into the center comes out clean. Let the loaf cool in the pan for about 10 minutes, then remove from the pan and transfer to a wire rack to cool completely.
08 -
While the loaf cools, prepare the glaze by whisking together powdered sugar and lemon juice in a small bowl. Adjust the consistency by adding more lemon juice or powdered sugar as needed.
09 -
Once the loaf has cooled, drizzle the glaze over the top and allow it to set for a few minutes before slicing.