In a bowl, rub together sugar and lemon zest to release all the oils and flavour.
Add yogurt, milk and lemon juice. Mix well.
Sift in flour, baking powder and baking soda. Gently combine.
Add melted butter and mix until smooth. Do not overmix.
Rest the batter for 20-30 minutes.
Pipe into a greased madeleine mould.
Bake at 180°C for 10-12 minutes or until lightly golden.
