Cut a cross deep into the ball. Place dough in a large bowl with remaining flour, sugar and olive oil, orange blossom water and anise seeds. Knead, adding a teaspoon of warm water from time to time to keep dough very soft. Cut dough into two balls and place on a floured surface. With a rolling pin, flatten each ball into a 12-inch circle.
Place cookies on a round cookie sheet oiled with olive oil.
Widen the crosses with your fingers. Let cookies rise 7 hours in a warm area. Mix egg yolk with a teaspoon of water and brush each cookie with the mixture. Place cookies on lowest rack of oven. Bake at 300 degrees for 10 minutes.