Prepare your mise en place.
Combine the milk and yeast with the flour in a medium mixing bowl, stirring with a wooden spoon until a sponge forms. Cover with plastic film and set aside to rest for 10 minutes, or until the sponge doubles in volume.
To plump the raisins, place them in a small heat-proof bowl with very hot water to cover by 2.5 centimeters (1 inch). Set them