Wash lemons thoroughly and cut into halves.
Using a blender, puree 3-4 whole lemons (without seeds) to extract juice, oils, and pulp.
Add 1 can of sweetened condensed milk to blender and mix until smooth.
Gradually add ice cold water while blending until fully combined.
Stir in salt to balance the flavor.
Chill in refrigerator before serving over ice.