In a mixing bowl, combine 1 cup flour, 1 cup sugar, and 1 cup milk. Mix well.
Pour the mixture into a large ziplock bag or keep it in the bowl and cover with plastic wrap.
For the next 10 days, handle the starter according to the following instructions:
Day 1: Do nothing.
Day 2: Mash the bag or stir the mixture if in a bowl.
Day 3: Mash the bag or stir the mixture if in a bowl.
Day 4: Mash the bag or stir the mixture if in a bowl.
Day 5: Mash the bag or stir the mixture if in a bowl.
Day 6: Add 1 cup flour, 1 cup sugar, and 1 cup milk. Mix well.
Day 7: Mash the bag or stir the mixture if in a bowl.
Day 8: Mash the bag or stir the mixture if in a bowl.
Day 9: Mash the bag or stir the mixture if in a bowl.
Day 10: Add 1 cup flour, 1 cup sugar, and 1 cup milk. Mix well. Your starter is now ready to use.