Step 1

Preheat the oven to 350°F/175°C. Line a small springform pan with baking paper or lightly grease and dust with flour. Beat the egg whites with the salt until stiff. Set aside.

Step 2

Whisk together the yogurt, lemon juice, milk and melted butter. In another bowl, mix flour, baking powder, baking soda, lemon zest and sweetener. Add to the liquid ingredients and stir in briefly but vigorously. Finally, fold in the beaten egg whites.

Step 3

Pour batter into the smooth out and bake the cake for 25-35 minutes. It will remain very light white. Let cool and spread with frosting. For this, mix yogurt with lemon juice and sweetener to taste.