Preheat the oven to 170°C (338°F).
Cream the room temperature butter and sugar until smooth.
Add the eggs one at a time, mixing well after each addition.
Sift in the cake flour, baking powder, and salt, then mix until just combined.
Add the lemon zest and lemon juice to the batter.
Pour the batter into a pound cake mold.
Bake in the 170°C oven for 40–45 minutes.
Let cool, then drizzle with lemon glaze if desired.