In a pot over high heat, bring to a boil 6 cups of water.  Then add the red sweet potato leaves and boil the leaves for 5 minutes, then remove the leaves. 

Strain the potato leaves water in a large bowl or cup. 

In another bowl, dilute ½ cup HOT potato leaves water with sugar.

In a pitcher, add ice cube (if serving immediately, if not skip this step).

Next add calamansi juice, sweet potato water, sugar water, and mix until well combined. Notice as you pour the water the color of the water turns pinking red

Add lemon for garnish and serve immediately