In a medium bowl stir together the flour and baking powder; set aside. In a large mixing bowl beat eggs until they are light and fluffy. Gradually add sugar and beat for about 3 minutes. Stir in the oil and anise essence. Fold in the dry ingredients until well blended. Spread the mixture into a 20x30cm pan and bake for 15 to 20 minutes in the preheated oven.
When the pan cools slightly cut the biscuit down the middle lengthways. Cut each half into 1cm slices. Place slices onto a baking tray and return to the oven long enough to brown on each side, like toast. Store in a tightly covered container.