If not already done, peel, pit and chop the 2 very ripe mangoes into chunks.
Add the mango chunks, 1 cup (250 ml) coconut or soy yogurt and ½ cup (125 ml) water to a blender.
Add ¼ teaspoon ground cardamom if using. (Do not add the sugar yet if you prefer to taste first.)
Blend on low, then high, until the mixture is completely smooth and no large mango pieces remain.
Taste the lassi. If it is too thick, add a little water and blend again until you reach the desired consistency. If it is not sweet enough, add up to 2 teaspoons granulated sugar (optional) and blend again until dissolved.
Pour into glasses and serve immediately.
Notes
Use fresh or frozen mango.
Omit the spices if you prefer.
Use any type of plant-based yogurt.