Lemon pound cake (less sweetened) 柠檬磅蛋糕 | 一人份 Meal for One

this version is 20-30% less sugar. The lemon syrup is sour, bringing a refreshing balance to the cake.
ingredients:
cake flour 100g
unsalted butter 80g
granulated sugar 70g
baking powder 2g
eggs x2
lemon juice 25g
lemon zest of 2 lemons (mix with 5g sugar)
lemon syrup (sour):
lemon juice 30g
water 30g
sugar 15g