INGREDIENTS
1 cup
unsalted butter (225g, room temperature)
1 cup
caster sugar (225g, super fine sugar - not powdered)
3
large eggs (room temperature)
2 1/2 cups
all-purpose flour (300g)
2 1/2 tsp
baking powder
zest and juice of 1 1/2 lemons
2 cups
granulated sugar
1 cup
water
2
lemons (sliced 1/8" thick)