Lemon, Ricotta and Almond Flourless Cake

(1 sticunsalted butter (softened)

(1 1/3 cupcaster sugar

vanilla bean (split and seeds scraped)

lemon zest

eggs (separated and at room temperature)

(2 1/2 cupalmond meal

(10 1/2 oricotta

Flaked almonds (to decorated)

Icing sugar (for dusting)