Lemon Meringue Tea Cakes

Name: Lemon Meringue Tea Cakes
Prep time: 45 min
Cook time: 2 h 10 min
Total time: 2 h 10 min
Yield: 12 pieces
Ingredients: butter; 190 g caster sugar; 1 lemon; 3 eggs; 180 g self-raising flour; ¾ tsp baking powder; 1 tbsp lemon juice; 100 g Greek yogurt; 60 g sunflower oil; 110 g caster sugar; 1 lemon; 70 g freshly squeezed lemon juice; 80 g unsalted butter; 3 egg yolks; 1 medium egg; 3 egg whites; 140 g caster sugar; 1 pinch salt; lemon