Is it watermelon juice?
It is a shake made by blending watermelon with water and ice. Because the ice is blended in, the texture differs from a drink of pressed watermelon juice alone.
Nam Taeng Mo Pan · น้ำแตงโมปั่น
If you want a cold drink as you walk on a hot day in Thailand, try the watermelon shake, nam taeng mo pan. Watermelon is blended with water and ice. Unlike watermelon juice that you drink like plain juice, the ice is blended in together so you enjoy it cold. If you want less sweetness, say so when you order, asking for less syrup or sugar.
The cold, fine texture of blended ice is added to the taste of watermelon. The taste of one cup can change with the ratio of watermelon to ice and the sweetener added.
If you want less sugar or syrup added, say so before it is made.
The Tourism Authority of Thailand introduces the watermelon shake as a typical fruit drink made by blending watermelon with water and ice. The familiar watermelon can be enjoyed as a street drink on a Thai trip. Watermelon is a fruit available all year round, but whether a shop actually sells the drink differs from shop to shop.
It is a shake made by blending watermelon with water and ice. Because the ice is blended in, the texture differs from a drink of pressed watermelon juice alone.
The watermelon's own sweetness remains. The sugar or syrup that adds sweetness differs from shop to shop, so ask before the drink is made for less or none.
If you want to read more about these dishes and regions, these sources are a good place to start. Ingredients and cooking methods can differ from one eatery to another.