Wash the limes thoroughly

Cut the limes into quarters

Add lime pieces and cold water into a blender

Blend quickly for about 10–15 seconds

Strain the mixture:

Pour the blended mixture through a fine mesh strainer

Discard the pulp and peel

Finish the drink:

Pour the strained lime juice back into the blender

Add sweetened condensed milk, sugar, and ice

Blend again until smooth and frothy

Serve immediately in tall glasses and garnish with lime slices.