Almond Sponge Cake

Name: Almond Sponge Cake
Prep time: 10 min
Cook time: 20 min
Total time: 30 min
Cuisine: European, British
Ingredients: 5 egg whites; 5 egg yolks; ½ cup plain yogurt; 4 packets of Stevia; 1 Tbsp. alcohol free vanilla; Zest of one lemon, preferably organic; 1 ¾ cups almond flour; 3 eggs; 3 packets of Stevia; 1 tsp. alcohol free vanilla; ¼ cup coconut oil, melted but not too hot; 2 Tbsp. lemon juice