Chocolate orange shortbread cookies

unsalted butter (110g, 1 stick)

sugar (55g, aprox 1/4 cup, I used brown sugar but regular, fine sugar is also good)

all purpose flour (110g, approx 3/4 cup, I recommend Bob's Red Mill Organic All Purpose Flour)

corn starch (55g cornflour, approx 1/2 cup)

orange zest (finely grated zest from 1 orange)

semi sweet chocolate (110g, you probably will not need all but to allow some depth to dip in)