Prune Whip

When we moved to our new house when I was 5 years old, almost everything was better than in the old apartment. We had bigger rooms, more rooms, a big yard and lots of friends to play with. We even had a big new refrigerator. There was only one thing in the new house I didn't like as well, and that was the prune whip. Prune whip was a dessert that my Mommy made.
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Here is the recipe (which I still have, written by Mommy):
1 can (4 oz.) baby prunes (Junior baby food) or prune pulp
1 1/3 tablespoon lemon juice
1/8 tsp salt

1 small can cold evaporated milk
1 tsp lemon juice.
1/3 cup sugar

Mix together the prunes, 1 1/3 T lemon juice and salt.
In a different chilled bowl, with a chilled egg beater (or an unchilled mixer), beat until stiff the evaporated milk and 1 tsp lemon juice. Then beat in 1/3 C or a little more sugar and the prune mixture. Put into a freezable dish and put in the freezer.
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Here was the trouble. In our apartment we had a little old refrigerator where the freezer compartment was just a little box inside the other compartment. It didn't keep things very cold, just barely frozen. So the prune whip came out really creamy and soft, cold and delicious. When we got our new refrigerator, it had a separate freezer compartment. The prune whip got too hard and icy.
I think I should make prune whip again sometime soon, but eat it before it gets frozen too hard!