First, position the mango with the stem side down on a cutting board.
Next, use a large sharp knife to cut alongside the wide part of the pit as close to it as possible from the top of the mango down one side of the pit.
Repeat the same process on the other side of the mango. You will end up with two halves and a middle section with the pit intact.
When ready, cut the two small sides off the middle section from the top down the side towards the stem. Once done, you should have four pieces of mango.
Next, score the mango flesh for any of the four pieces by making lengthwise and crosswise cuts, being careful not to cut through the peel.
Finally, use a spoon to scoop out the pieces of mango from the peel.
Next, put the mango pieces, yogurt, milk, sugar, and cardamom into a blender and mix until smooth.
Add water or milk to adjust the consistency to your preference and then blend in some ice to chill it even more.
To serve, pour the mango lassi into serving glasses and then garnish with saffron, pistachios, and mint leaves.