Heat the ½ tbsp vegetable oil in a small saucepan over medium heat. Fry the 1 tsp garlic for 30 seconds until fragrant, then add the ½ tbsp sambal oelek and 3 tbsp tamarind puree.
Add the ⅓ cup water, mix well until smooth and heat until it begins to bubble.
Add the 1 tbsp sugar and 1 tbsp fish sauce, stir again until it boils then remove from the heat and allow to cool. Transfer to a small dipping bowl.
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Notes
Watch Your Heat - There's no need for high heat here, you only want to lightly fry your garlic, then warm the tamarind and dissolve the sugar. Don't overcook it!
Find Your Balance - We like our sauce quite tart, but you can add more sugar if you need to tone it down. If you love heat, then amp up that chilli too!
Add Shallots - Add finely chopped shallot when you fry the garlic for added flavour.
Add Peanut - Peanut butter into the mix or crushed peanuts on top as a garnish.