This is different than a traditional Lassi in that it doesn't include yogurt. It is something like a thin milkshake with a bit of spice. Recipe is from Vegetarian Planet. There is also a variation to make it a warm drink.
Combine all of the ingredients except the ice in a blender. Blend for 30 seconds to froth the milk.
Add the ice cubes, and blend until the ice is pulverized. Pour the lassi into large glasses filled with ice, and serve.
Variation: The same ingredients can make a soothing warm drink. Increase the milk to 3 cups, and heat it almost to a boil. Add the honey, ginger, and nutmeg, and stir well. Omit the ice. Serve in mugs.