Prepare the avocado by halving it, carefully removing the pit, and scooping the flesh into a high-speed blender.
Add the Greek yogurt, milk, and ground cinnamon to the blender.
Blend on high for 30-60 seconds, or until the mixture is completely smooth and creamy with no lumps.
Add 2 tablespoons (30 ml / 1 fl oz) of honey and 1 teaspoon of rose water to start.
Blend for another 10 seconds to combine.
Taste the lassi. Rose waters can vary in strength, so add more little by little, along with more honey if you prefer it sweeter.
Blend briefly after each addition.
Once the flavor is balanced to your liking, pour the lassi into two tall glasses.
Serve immediately and enjoy.
Garnish your lassi with a sprinkle of ground cinnamon, finely chopped pistachios, or a few edible dried rose petals for a beautiful presentation.