With just a handful of simple ingredients, this lemon rhubarb loaf delivers a burst of tangy-sweet flavor in every bite. The tender crumb, speckled with ruby-red rhubarb and bright lemon zest, is impossible to resist—especially when paired with a cup of tea on a lazy afternoon.
Preheat oven to 350°F. Grease a 9x5-inch loaf pan and line with parchment paper, leaving an overhang for easy removal.
In a medium bowl, whisk together flour, baking powder, baking soda, and salt. Set aside.
In a large bowl, beat softened butter and sugar until light and fluffy, about 3 minutes. Add eggs one at a time, mixing well after each. Stir in vanilla.
Alternate adding the dry ingredients and buttermilk to the butter mixture, beginning and ending with the dry ingredients. Fold in rhubarb, lemon zest, and lemon juice until just combined.
Pour batter into prepared loaf pan and smooth the top. Bake for 50-60 minutes, or until a toothpick inserted in the center comes out clean.
Let cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before slicing.