01 - 
                Preheat your oven to 175°C (350°F). Grease and line a 9x5-inch loaf pan.
              
              
              
                02 - 
                In a large bowl, cream the butter and sugar together until light and fluffy.
              
              
              
                03 - 
                Beat in the eggs, one at a time, then add the lemon juice and lemon zest.
              
              
              
                04 - 
                In a separate bowl, whisk together the flour, baking powder, baking soda, and salt.
              
              
              
                05 - 
                Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Stir in the sour cream or yogurt until the batter is smooth.
              
              
              
                06 - 
                Gently fold in the diced rhubarb.
              
              
              
                07 - 
                Pour the batter into the prepared loaf pan and spread evenly.
              
              
              
                08 - 
                Bake for 50–60 minutes, or until a toothpick inserted into the center comes out clean.
              
              
              
                09 - 
                Allow the loaf to cool completely in the pan for about 10 minutes, then transfer to a wire rack to cool fully.
              
              
              
                10 - 
                To make the glaze, whisk together powdered sugar and lemon juice until smooth. Add rhubarb syrup for color if using.
              
              
              
                11 - 
                Drizzle the glaze over the cooled loaf. Slice and serve.