|3 tbsp||walnut oil|
|1 tbsp||baking powder|
|4 tsp||poppy seeds|
|100 g||confectioner's sugar|
Pre-heat oven to 200°C/400°F. Grease baking pan and line with parchment paper.
Beat eggs in a large bowl. Add sugar and beat until frothy. Add walnut oil and yogurt, then sift in flour and baking powder. Zest one grapefruit and press the juice. Add zest and juice along with poppy seeds to the mixture and stir into smooth batter.
Add cake batter to baking pan. Place in oven for approx. 40 min., or until a toothpick inserted into the center of the cake comes out with a few moist crumbs. Remove from oven and place on a wire rack to cool.