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Crush tulsi/holy basil leaves and mint (pudina) leaves. Place them in a bowl.
 
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Lightly pound green cardamom, black cardamom, and place them in same bowl.
 
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Add ginger, cinnamon, cloves, whole black peppers, munnaka (raisins) in the same bowl and soak them in couple to tablespoons of water overnight. I keep them in fridge.
 
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Next morning in a pan heat 2.5 cups of water add these soaked ingredients along with water in which these are soaked and simmer for 4-5 minutes.
 
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Drink this hot.