1. Begin by taking a bowl of water and gradually mix in the ragi flour to create a smooth slurry. Ensure there are no lumps.
2. In another pan, bring water to a boil on the stove. Once boiling, slowly pour in the ragi flour slurry, stirring continuously.
3. Cook the mixture until it thickens and then set the ragi mixture aside to cool completely.
4. In a blender, combine the cooled ragi porridge, milk, jaggery, raisins, cashew nuts, and melted chocolate.
5. Blend all the ingredients together until the mixture is smooth and creamy.
6. Ensure that there are no lumps and that the ingredients are well incorporated.
7. Pour the blended shake into serving glasses. For an extra touch of sweetness and a visually appealing presentation, garnish with chopped almonds and some chocolate syrup on top.
8. If you prefer a chilled shake, add some ice cubes to the shakes.