Apricot and walnut madeleines

1 Wash the apricots, cut them in half, remove the stones and cut into small cubes. Chop the walnuts. 2 Break the eggs into a large bowl, add the sugar and stir with a whisk until the mixture starts to thicken. Add the flour mixed with baking powder, and the lemon zest, and stir again. Add the melted butter and mix until blended. Finally, add the apricots and walnuts. 3 Pour the mixture into 12 muffin cups, filling them so that they are ¾ full, and bake in the oven, preheated to 180°C, for 15-20 minutes.