300 g  Plain Flour , for crust

60 g  Plain Flour , for filling

66 g  Powdered Sugar , for the shortbread, plus more for dusting

0.5 tsp  Salt

170 g  Flora Plant Butter Unsalted Alternative to Butter , melted

3 tbsp  Lemon Zest

600 g  Sugar

8  Large Eggs , room temperature

240 ml  Lemon Juice