Hello Markus. Making a traditional lassi at home after a long workday is wonderfully quick and straightforward. You do not need any specialized equipment, and standard plain whole-milk yogurt works perfectly for this.
To make a classic sweet lassi for one serving, you will need one cup of plain yogurt, half a cup of cold water or crushed ice, and about one and a half to two tablespoons of sugar, adjusted to your preferred taste. For that signature aroma you likely remember from your travels, I strongly recommend adding a small pinch of ground green cardamom and, if you happen to have it, half a teaspoon of rose water.
The preparation takes only about two minutes. Add your cold yogurt, water, sugar, and cardamom to a blender. Blend on medium speed for roughly twenty to thirty seconds until the mixture is completely smooth, the sugar is fully dissolved, and a thick, frothy layer forms on top. If you prefer not to wash a blender after work, you can achieve a similar result by placing the ingredients in a tall jar and whisking briskly with a hand whisk or shaking vigorously in a sealed mason jar.
Alternatively, if you ever feel like having a traditional savory lassi instead, you can omit the sugar and cardamom entirely and instead mix the yogurt and water with a quarter teaspoon of roasted ground cumin and a pinch of black salt or regular salt.
Pour the drink into a tall glass immediately so you can enjoy the refreshing froth at the surface. I hope this brings back pleasant memories of your family holidays.