Algerian lemon and olive oil cookies (Twabaa)

3 large eggs, 63g each

210g of caster sugar, plus extra for sprinkling

1 1/2 tsp vanilla extract

320g of plain flour, unbleached

1 pinch of sea salt, fine

1 egg, beaten for glazing

105ml of light olive oil

1 lemon, organic, zested

1 tsp baking powder