This Thai cucumber relish is a refreshing and tangy side dish that pairs perfectly with a variety of main courses. The crispness of the cucumber combined with the sharpness of red onion and the sweetness of the vinegar mixture creates a delightful balance of flavors. It's quick to prepare and adds a vibrant touch to any meal.
If you don't usually stock rice vinegar in your pantry, you might need to pick some up at the supermarket. It's a key ingredient that provides the tangy base for this relish. Additionally, fresh cilantro is essential for that burst of herbaceous flavor, so make sure to grab a bunch if you don't have any on hand.

Ingredients For Thai Cucumber Relish
Cucumber: Thinly sliced for a crisp texture and refreshing taste.
Red onion: Adds a sharp, pungent flavor and a bit of crunch.
Rice vinegar: Provides the tangy base for the relish, balancing the sweetness and saltiness.
Sugar: Adds a touch of sweetness to balance the acidity of the vinegar.
Salt: Enhances the overall flavor of the relish.
Cilantro: Freshly chopped to add a burst of herbaceous flavor and a pop of color.
Technique Tip for This Relish
For an extra burst of flavor, lightly toast the rice vinegar in a small saucepan over low heat before mixing it with the sugar and salt. This will enhance the depth of the vinegar's taste, adding a subtle complexity to your Thai cucumber relish.
Suggested Side Dishes
Alternative Ingredients
cucumber - Substitute with zucchini: Zucchini has a similar texture and mild flavor, making it a good alternative in the relish.
red onion - Substitute with shallots: Shallots offer a milder and slightly sweeter taste, which can complement the other ingredients well.
rice vinegar - Substitute with apple cider vinegar: Apple cider vinegar has a similar acidity and a slightly fruity flavor that can work well in the relish.
sugar - Substitute with honey: Honey provides a natural sweetness and can dissolve easily in the vinegar mixture.
salt - Substitute with soy sauce: Soy sauce adds saltiness along with a depth of umami flavor, enhancing the overall taste.
fresh cilantro - Substitute with fresh parsley: Fresh parsley offers a similar fresh and slightly peppery flavor, making it a good alternative to cilantro.
Alternative Recipes Similar to This Relish
How To Store / Freeze This Relish
- Ensure your Thai cucumber relish is completely cooled before storing. This helps maintain its crisp texture and vibrant flavors.
- Transfer the relish to an airtight container. Glass jars with tight-fitting lids are ideal as they prevent any unwanted odors from seeping in.
- Store the container in the refrigerator. The relish will keep well for up to one week, retaining its fresh and tangy taste.
- For longer storage, consider freezing. However, note that freezing may alter the texture of the cucumbers, making them slightly less crisp.
- To freeze, place the relish in a freezer-safe container or a heavy-duty freezer bag. Remove as much air as possible to prevent freezer burn.
- Label the container with the date of preparation. This helps you keep track of its freshness.
- When ready to use, thaw the relish in the refrigerator overnight. Give it a good stir before serving to redistribute the flavors.
- If the texture of the cucumbers has softened too much after freezing, consider using the relish as a flavorful topping for grilled meats or sandwiches where the texture change will be less noticeable.
- Always use a clean spoon to scoop out the relish to avoid introducing any contaminants that could shorten its shelf life.
How To Reheat Leftovers
Cold Refresh: The beauty of Thai cucumber relish is its crisp, refreshing nature. Instead of reheating, consider serving it cold. Simply give it a good stir to redistribute the vinegar mixture and ensure the cucumbers and red onions are evenly coated. This method preserves the crunch and vibrant flavors.
Room Temperature: If you prefer it not straight from the fridge, let the relish sit at room temperature for about 15-20 minutes. This slight warming will enhance the flavors without compromising the texture.
Microwave: If you must warm it slightly, use the microwave on a low setting. Place the relish in a microwave-safe bowl and heat for no more than 10-15 seconds. Be cautious, as too much heat can make the cucumbers soggy.
Warm Water Bath: For a gentle warming, place the container of relish in a bowl of warm water for a few minutes. This method gradually brings the relish to a slightly warmer temperature without cooking it.
Quick Sauté: For a unique twist, quickly sauté the relish in a hot pan with a splash of olive oil. This will give the cucumbers a slightly different texture and a warm, tangy flavor. Be sure to do this quickly to avoid overcooking.
Best Tools for This Recipe
Mixing bowl: A large bowl used to combine the rice vinegar, sugar, and salt, and later to toss the cucumber and red onion.
Measuring cups: Used to measure the 2 cups of cucumber and ¼ cup of red onion accurately.
Measuring spoons: Used to measure the ¼ cup of rice vinegar, 2 tablespoons of sugar, 1 teaspoon of salt, and 1 tablespoon of fresh cilantro.
Knife: Essential for thinly slicing the cucumber and red onion, as well as chopping the fresh cilantro.
Cutting board: Provides a safe surface for slicing the cucumber, red onion, and chopping the cilantro.
Mixing spoon: Used to stir the vinegar, sugar, and salt mixture until dissolved, and to toss the cucumber and red onion in the bowl.
Serving dish: A dish to present the Thai cucumber relish attractively before serving.
How to Save Time on Making This Relish
Pre-slice ingredients: Prepare the cucumber and red onion in advance and store them in the fridge to save time when assembling the relish.
Use a mandoline: A mandoline slicer can quickly and uniformly slice the cucumber and red onion, speeding up prep time.
Dissolve in warm vinegar: Use slightly warm rice vinegar to dissolve the sugar and salt faster, then let it cool before adding the vegetables.
Batch prep: Make a larger batch of the vinegar mixture and store it in the fridge for future use, cutting down on prep time for subsequent servings.

Thai Cucumber Relish
Ingredients
Main Ingredients
- 2 cups cucumber, thinly sliced
- ¼ cup red onion, thinly sliced
- ¼ cup rice vinegar
- 2 tablespoon sugar
- 1 teaspoon salt
- 1 tablespoon fresh cilantro, chopped
Instructions
- In a mixing bowl, combine the rice vinegar, sugar, and salt. Stir until the sugar and salt are dissolved.
- Add the cucumber and red onion to the bowl. Toss to coat evenly with the vinegar mixture.
- Sprinkle with chopped cilantro before serving.
Nutritional Value
Keywords
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