BANH MI LABS

tuong ot vietnamese chili sauce (tương ớt) with fresh red chilies garlic and tomato paste on dark slate

Tương Ớt (Vietnamese Chili Sauce)

Tương ớt is Vietnamese chili sauce. It is not Sriracha. Sriracha is Thai in origin and significantly hotter than what Vietnamese cooks actually use on their food. Tương ớt is moderately spicy, slightly sweet, and built around fresh chilies and garlic with a small amount of tomato that rounds the heat and adds a faint fruitiness. It is the chili sauce sold at every bánh mì shop in Vietnam, squeezed or spooned inside the sandwich just before it closes or served on the side for dipping.

The two dominant brands in Vietnam are Cholimex and Chin-Su. Both are widely available at Vietnamese grocery stores outside Vietnam. Making it from scratch takes 10 minutes and produces a cleaner result with no preservatives. The ratio is simple. The technique is simple. The result is the correct heat element for every sandwich on this site.

tuong ot vietnamese chili sauce (tương ớt) with fresh red chilies garlic and tomato paste on dark slate
L. Nguyen

Tương Ớt (Vietnamese Chili Sauce)

Fresh red chilies and garlic blended with sugar, rice vinegar, and a small amount of tomato paste into a moderately spicy, slightly sweet chili sauce. The correct heat element for bánh mì. Not Sriracha. [ BEGINNER ]
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Prep Time 5 minutes
Cook Time 5 minutes
Total Time 10 minutes
Servings: 20 bánh mì
Course: Condiment
Cuisine: Vietnamese
Ingredients Equipment Method Notes

Ingredients
  

The Sauce
  • 100 g fresh red chilies, stems removed
  • 4 garlic cloves, roughly chopped
  • 2 tbsp sugar
  • 1 tbsp rice vinegar
  • 1 tbsp tomato paste
  • ½ tsp fine salt
  • 120 ml water

Equipment

  • Small blender or food processor
  • Small saucepan

Method
 

Make the Sauce
  1. Combine the red chilies, garlic, and water in a small blender or food processor. Blend until completely smooth. The mixture should look like a thin bright red liquid with no visible chunks. If chunks remain, blend for another 30 seconds.
  2. Pour the blended mixture into a small saucepan over medium heat. Add the sugar, rice vinegar, tomato paste, and salt. Stir to combine. Bring to a gentle simmer and cook for 5 minutes, stirring occasionally. The sauce will thicken slightly and darken in color as it cooks. Do not boil hard. A gentle simmer extracts the flavor from the chilies without making the sauce bitter.
  3. Remove from heat and let cool completely before using. The sauce thickens further as it cools. Transfer to a clean sealed jar and refrigerate. The flavor develops and improves over the first 24 hours.

Notes

On chili choice: Bird's eye chilies produce serious heat. Fresno chilies produce a milder, fruitier result closer to the Cholimex standard. A mix of two-thirds Fresno and one-third bird's eye produces the correct balance of heat and flavor. Taste the chilies before blending to calibrate the final heat level.
On the tomato paste: Cholimex, the most widely consumed Vietnamese chili sauce brand, uses real tomatoes in their formula. Tomato paste is the correct home cooking substitute. It adds body, a slight fruitiness, and rounds the sharp edge of the vinegar without making the sauce taste like tomato. One tablespoon is correct.
On sweetness: Vietnamese chili sauce is noticeably sweeter than Sriracha. The sugar is not there to make it a sweet sauce. It is there to balance the heat and acidity. The correct finished sauce should taste spicy first, then sweet, with a clean vinegar note underneath.
On storage: Keeps for 3 weeks refrigerated in a sealed jar. The color will deepen slightly over time but the flavor remains correct.
On store-bought: Cholimex tương ớt and Chin-Su chili sauce are the correct store-bought versions. Both are available at Vietnamese grocery stores. Do not use Sriracha as a substitute. The heat level, sweetness, and flavor profile are different enough to change the finished sandwich.

[ THE SCIENCE ]

The heat in tương ớt comes from capsaicin, the compound in chili peppers that triggers the pain receptors in your mouth. Bird’s eye chilies contain significantly more capsaicin than Fresno or jalapeño chilies. This is why the chili choice matters. Cooking the sauce after blending does two things. The heat breaks down the cell walls of the chili and releases more capsaicin into the liquid, which is why cooked chili sauce is hotter than raw blended chili. At the same time, the heat drives off some of the volatile compounds that give raw chili its sharp grassy edge. The result is a rounder, more integrated heat. Think of it like the difference between raw garlic and cooked garlic. Same ingredient, completely different character depending on whether heat is applied. The tomato paste accelerates this rounding effect because its natural sugars caramelize slightly during cooking and soften the overall flavor.

[ THE FAQ ]

Is tương ớt the same as Sriracha? No. Sriracha is a Thai hot sauce that became popular in Vietnamese restaurants outside Vietnam but is not the chili sauce Vietnamese cooks use on their own food. Tương ớt is moderately spicy, slightly sweet, and has a tomato component that Sriracha does not. The two sauces have a different heat level, sweetness, and flavor profile. Sriracha is an acceptable substitute in an emergency but it is not the correct sauce for bánh mì.

How spicy is tương ớt? Moderately spicy. It should build heat gradually rather than hit hard immediately. The Cholimex and Chin-Su versions are milder than Sriracha. The homemade version can be calibrated by adjusting the ratio of bird’s eye to Fresno chilies. Start with all Fresno for a mild result. Add bird’s eye gradually to increase heat.

Where can I buy Vietnamese chili sauce? Cholimex tương ớt and Chin-Su chili sauce are available at Vietnamese grocery stores and most Asian supermarkets. Both come in squeeze bottles. Look for the section with Vietnamese condiments rather than the general hot sauce aisle.

Can I use this as a dipping sauce? Yes. Tương ớt works both inside the sandwich and alongside it as a dipping sauce. Applied inside, it goes on just before the sandwich closes. Served on the side, it is spooned directly onto each bite. Both approaches are correct.

How long does homemade tương ớt keep? Three weeks refrigerated in a sealed jar. The color deepens slightly as it sits but the flavor remains correct. If the sauce separates in the jar, stir before using. Do not freeze. The texture becomes watery after defrosting.

[ THE EQUIPMENT ]

A small blender or food processor breaks the chilies and garlic down into a completely smooth liquid. A small saucepan cooks the sauce gently without scorching. No other equipment is needed.

The full equipment list with specific recommendations is on the Equipment page.

[ WHAT TO READ NEXT ]

The Classic Bánh Mì Thịt Nguội is the sandwich where tương ớt plays its most traditional role. Cold cuts, pâté, Vietnamese mayonnaise, and pickled daikon on a Glass Crust baguette. The chili sauce goes on last, just before the sandwich closes. That assembly sequence is covered in full on the recipe page.

Bánh Mì Que is the recipe in the archive where chili sauce has the most prominent role. Finger-sized baguettes filled only with pork liver pâté and served with chỉ chương, the fermented chili dipping sauce of Hai Phong. The logic of a chili sauce as the primary condiment rather than a finishing element is different and worth understanding.

The Maggi Dipping Sauce is the other condiment in the archive that finishes a bánh mì from the outside. Where tương ớt provides heat, Maggi provides depth. Both are used on the same sandwich by Vietnamese street vendors. Using both is the correct approach.