I understand this to be mostly a Northern Colombian drink, though I’d be happy to go investigate this in person if it is necessary to maintain the quality editorial on this site. Which it is, right? Right?

This drink is as tart as a good glass of lemonade and as refreshing as a slushie with the decadence of a milkshake. It’s barely sweet, simple as written and, I imagine, endlessly tweakable with whatever sounds good to you. I don’t think it would be unwelcome with mango or pineapple chunks blended in. I bet you could use canned cream of coconut (the sweet stuff) or sweetened condensed milk as a sweetener instead of sugar. You could add cinnamon or nutmeg on top, Caribbean-style. You could add white rum, grownup-style. You could make it sweeter, kid-style. But we had it just like this, and we’re going to do it again all summer.

Yield: 3 cups (we divided into 4 8-ounce glasses)

• 2 1/2 cups crushed or small ice cubes
• 1 cup coconut milk, well-shaken if from a can
• 1/3 cup lime juice (from about 3 limes)
• 3 tablespoons granulated or superfine sugar (more or less to taste)
• Lime slices for garnish

Blend every thing until it reaches your desired consistency — almost smooth, for a crunchier effect, or fully smooth, for a milkshake/creamier effect. Pour into glasses, garnish with lime and don’t forget to share.

Source: http://smittenkitchen.com/blog/2014/06/limonada-de-coco/