To make the batter, use an electric mixer to beat the eggs and sugar well until creamy and a pale yellow colour.
Add the lemon zest and juice, poppy seeds, baking powder and flour and mix well to incorporate.
Melt the butter over a low heat, then cool it slightly before adding it to the rest of the ingredients.
Mix well to incorporate.
Cover the bowl with clingfilm and refrigerate for at least 20 minutes, the cooler the batter, the fluffier the madeleines.
Grease and flour the madeleine tray too, and refrigerate at the same time with the batter.
Preheat the oven to 200 degrees Celsius (390 Fahrenheit).
Use one spoonful of batter per madeleines hole, and bake for 9-10 minutes until golden and well risen.
Remove from the oven and leave to cool completely.
To make the glaze, add the chocolate chips and cream to a pan set over a low heat, and use a spatula to mix until melted and smooth.
Leave to cool completely, then dip each madeleine in the chocolate sauce.
Top with lemon zest.