Summer pudding

This is in the tradition of English puddings using the bounty of the season. It is also a handy way of using left over bread! I make it in a 1 1/2 quart pudding basin - a lampshade shaped basin. Since I did this for July 4th. I served the red dish on a blue plate with white whipped cream.

Ingredients
1 1/2 lb raspberries
12 oz blueberries
8 oz blackberries
1 cup superfine sugar
several slices of challah or other light, absorbent bread. Do not use sourdough.
Whipped cream - to serve

Method
Clean the berries and place them into a saucepan with the sugar. Bring to a simmer slowly,  stirring occasionally. You want the berries to give up their juices but not to become cooked.
Meanwhile spray the pudding basin with non-stick spray (or grease lightly with butter). Cut the crusts off the bread slices. Make a circular piece of the bread, dip it into the juices and place in the bottom of the basin. Line the sides of the basin with bread slices - also dipped in the juices. Make sure that there are no gaps - overlapping the slices as necessary.
When the fruit has cooled, somewhat, pour the fruit and some of the juice into the lined basin. Create a bread "lid" for the basin, dip it in the juice and put it on the top of the fruit. reserve the remainder of the juice
Pour some of the remaining juice onto the bread lid.
Cut a circle of waxed paper (butcher paper is fine) to the size of of the top of the basin and place on top of the lid. Place a small plate on top of the waxed paper and then a weight on top of that. I am using a 28 oz can of tomatoes as the weight.
Refrigerate the weighted basin for at least 8 hours - and for anything up to 48 hours.
Unmold the pudding from the basin, and serve with whipped cream alongside.