Blueberry Croissant Pudding

The materials needed to make a blueberry croissant pudding :
Butter or margarine to spread
300 grams of bread croissants (plain )
4 eggs
250 ml heavy cream ( thick cream )
500 ml of liquid milk
100 grams of brown sugar
50 grams of unsalted butter , melted
2 tsp grated lemon peel
200 grams of frozen blueberries

How to make blueberry pudding