In a pot over medium heat, add water and corn starch, stir vigorously until no lumps is there, keep stirring until the mixture is thick and creamy. Remove from heat and let it cool down.
In a blender, add garlic,lime juice, salt and blend for a minute.
Add the cornstarch mixture and blend until well combined. Slowly add the oil while the blender is running until until it is emulsified and smooth..
You may serve immediately or chill until needed.*
Notes
* This dip might thicken when chilled, stir in a teaspoon of water at a time until you get the desired thickness then adjust the seasoning.