Add 1 cup of boiling water, stir and let sit for about 20 minutes.
With an electric mixer, cream together 4 Tbsp butter and 1 cup brown sugar.
Add the eggs, one at a time, and beat until batter turns pale and is smooth.
Fold in the flour with a metal spoon and then add date mixture.
Stir until combined.
Pour the mixture in a 8 inch cake pan that has been greased with cooking spray.
Bake for about 35-40 minutes until cooked through.
Let cool for 5 minutes and turn out onto a wire rack.
Once cooled, place on a plate, or freeze until ready to use.
Sauce
In a small saucepan, combine 1 1/2 Tbsp butter, whipping cream, vanilla and 1 cup light brown sugar. Cook on low heat until butter is melted, then 5 minutes longer.
Notes
To serve, cut pudding into wedges on a plate along with a scoop of ice cream. Pour sauce on top.