In a pan add chopped lemongrass, grated ginger and sugar.
Add 1 cup water and boil till it bubbles. Turn down flame and let it cool to room temperature.
In a mortar pestle add a few saffron strands and crush them with a pestle. Add 2 cubes of ice and let them stand for a while.
As they melt, they will extract the color and flavor from the saffron.
Transfer the saffron infused water to a jar.
Once the lemongrass mixture is cool, strain it into the jar with saffron and mix. This syrup can be refrigerated for a week.
In a glass add ice cubes. Pour 2-3 tablespoon of the prepared syrup in the glass and top with water.
Serve with a sprig of mint and a stalk of lemongrass.