Preheat the oven to 170°C (338°F).
Finely chop the yuzu marmalade.
In a bowl, cream together the butter and sugar.
Add the eggs one at a time, mixing well after each addition.
Add the yogurt and mix.
Sift in the cake flour, baking powder, and salt, then mix until combined.
Add the chopped yuzu marmalade, lemon juice, and lemon zest, and mix well.
Pour the batter into a pound cake pan.
Bake in the preheated oven at 170°C (338°F) for 40-45 minutes.
Let it cool, slice, and serve.