Sinigang Soup: How to Make Filipino Pork Sour Soup

Sinigang is a Filipino sour soup, commonly made with pork, vegetables and a tangy tamarind broth. This version simmers pork shoulder with tomatoes, radish and taro, then adds quick-cooking vegetables near the end so they stay bright and tender. Serve it hot with steamed rice; sourness and vegetable choices vary from household to household, so the broth is easy to adjust to taste.

Before you start, cut the pork and vegetables into similar-sized pieces and keep the leafy greens separate from the firmer vegetables. A large heavy pot and a spoon for tasting are all you need beyond basic kitchen tools. The simmer is mostly hands-off, but wait to add the souring mix until the pork is tender so you can judge the broth accurately.

What You’ll Need

2 lb (900 g) boneless pork shoulder, cut into 1½-inch (4 cm) cubes. Pork ribs also work, though they may need a little longer to become tender.
8 cups (1.9 L) water, plus a little more if needed during simmering.
1 medium yellow onion, about 7 oz (200 g), peeled and cut into wedges.
2 medium ripe tomatoes, about 10 oz (300 g), cut into wedges.
2 tablespoons (30 ml) fish sauce, plus more to taste.
1 packet (about 1.4 oz / 40 g) tamarind sinigang soup mix. Packet sizes and salt levels vary, so begin with about three-quarters of a packet and add more gradually. For a less convenient but less seasoned alternative, use 2 tablespoons (30 g) tamarind concentrate and adjust the sourness to taste; fresh tamarind pulp can also be simmered in the broth and strained.
10 oz (300 g) taro root, peeled and cut into 1-inch (2.5 cm) chunks. Taro helps thicken the broth slightly; omit it if unavailable, or add another potato, knowing the soup will be less silky.
1 daikon radish, about 7 oz (200 g), peeled and sliced into ½-inch (1 cm) half-moons.
1 small Asian eggplant, about 9 oz (250 g), cut into thick diagonal slices.
5 oz (150 g) long beans, cut into 2-inch (5 cm) lengths. Green beans are an easy substitute, with a slightly different texture.
4 oz (120 g) water spinach (kangkong), leaves and tender stems separated into manageable lengths. If it is hard to find, use spinach; it wilts more quickly and has softer stems.
1–2 green finger chilies, whole or split lengthwise, optional.
Steamed rice, for serving; black pepper, optional.

Step-by-Step

Prepare the ingredients. Cut the pork into even cubes so they cook at roughly the same rate. Peel and chop the taro and radish, wedge the onion and tomatoes, and slice the eggplant and beans. Rinse the water spinach well, especially around the stems, and set it aside. Keep the tamarind mix unopened for now. Allow about 25 minutes for this preparation and measuring.
Start a clean, savory broth. Put the pork, water, onion, tomatoes and fish sauce in a large pot. Bring it just to a boil over medium-high heat, then lower the heat to maintain a gentle simmer. Skim off the gray foam that rises during the first few minutes; this is optional but gives the broth a cleaner appearance. Avoid a hard rolling boil, which can make the pork fibers tighten and break the vegetables later.
Simmer the pork until tender. Partially cover the pot and cook at a steady, gentle simmer for 50 minutes. Check occasionally that the liquid is bubbling softly rather than boiling vigorously. If too much water evaporates, add a splash of hot water. The pork should be easy to pierce with a fork but still hold its shape. Check the thickest piece with a food thermometer: USDA FSIS lists 145°F (63°C) with a 3-minute rest as the safe minimum for whole cuts of pork. Because these shoulder cubes are simmered until tender, they will generally cook beyond that minimum; turn off the heat and let the soup stand for 3 minutes before serving.
Add taro and radish. Stir in the taro and radish and simmer for 10 minutes. Keep the simmer gentle. The taro should be nearly tender when pierced, and the radish should be softening but not collapsing. If using pork ribs instead of shoulder, check the meat for tenderness and extend the initial simmer before adding vegetables if necessary.
Season the broth with tamarind. Stir in about three-quarters of the sinigang mix and let it dissolve. Taste a spoonful after a minute, taking care because it is hot. Add more mix in small increments until the broth is pleasantly sour and savory. If using tamarind concentrate instead, stir it in gradually and taste between additions. Packet mix and concentrate differ in strength, so the listed amount is a starting point, not a reason to skip tasting. Add the chilies now if you want gentle heat.
Cook the remaining vegetables. Add the eggplant and long beans and simmer for 5 minutes, just until tender but not mushy. Add the water spinach and cook for 2 minutes, until the leaves wilt and the stems are tender. If using ordinary spinach instead of water spinach, add it at the very end and cook only until wilted, usually less than 2 minutes.
Make the final adjustments and serve. Taste the broth again. Add fish sauce for saltiness, a little more tamarind mix or concentrate for sourness, or a small splash of water if the flavor is too intense. Remove the pot from the heat and leave it undisturbed for the 3-minute pork rest. Serve in bowls with pork, vegetables and plenty of broth, alongside steamed rice. Diners can spoon rice into the broth or eat it separately.

Common Mistakes

Adding all the souring mix at once: Some packets are much saltier or more acidic than others. Starting with a partial packet lets you build the flavor instead of trying to correct an overly sharp or salty pot. Tamarind concentrate also varies in strength, so add it gradually.

Boiling the soup too hard: A vigorous boil can make the broth cloudy, break apart tender pork and turn the vegetables limp. Once the pot reaches a boil, reduce the heat until only occasional bubbles rise. Keep the lid partly on to reduce evaporation without trapping too much heat.

Putting every vegetable in at the beginning: Taro and radish need more time than greens. If water spinach simmers for the full hour, it loses its fresh color and can become stringy; eggplant and beans also soften too much. Follow the order in the steps and check for tenderness rather than relying only on the clock.

Trying to fix sourness with salt: Fish sauce adds salt and savory depth, but it does not reduce acidity. If the broth is too sour, dilute it with a little hot water or unsalted broth, then taste again. If it is bland but already sour enough, add fish sauce a teaspoon at a time.

Cutting pieces very unevenly: Small pork cubes can dry or become stringy while large ones remain chewy. Similarly, thin radish slices may disintegrate before the taro is tender. Keep the pork and firm vegetables close to the sizes listed, and cut taro carefully because it can be slippery after peeling.

Tips

Use ripe, juicy tomatoes because they add a rounded savory base to the tamarind. If your tomatoes are firm and pale, the broth may taste less full; add a little extra tomato or allow the onion and tomato to soften thoroughly during the first simmer. A few whole chilies bring aroma without making the entire pot very hot, especially if they remain uncut. Split them only if you want more heat to move into the broth.

For a clearer broth, skim the foam early and keep the pot at a low simmer. Do not stir constantly once the taro and eggplant go in, since both can break apart. If the soup is waiting for rice or diners, keep it warm over low heat without boiling; add the greens close to serving time so they do not sit in hot broth for long.

You can vary the vegetables while keeping the same cooking order. Daikon, taro, eggplant, long beans and water spinach are common choices, but family versions may use other vegetables or different proteins. Add firm vegetables first and delicate leaves last. If using a substitute such as spinach, green beans or potato, expect a slightly different texture and adjust its cooking time to tenderness.

Fish sauce is traditional in many versions, but it can be left out for a fish-free seasoning choice. Use salt sparingly instead and taste as you go; salt will season the soup but will not provide the same fermented, savory flavor. Tamarind sinigang mix is convenient and often includes salt and other seasonings, while plain tamarind concentrate gives you more control over seasoning but may require additional salt or fish sauce.

For leftovers, refrigerate the soup within 2 hours in shallow, covered containers. It keeps for 3–4 days in the refrigerator. Reheat only the portion you plan to eat, bringing it to 165°F (74°C) and checking with a food thermometer. The vegetables will soften further after storage, so if you are intentionally cooking ahead, you can keep the greens separate and add them when reheating.

Troubleshooting

The broth is too sour. Add hot water or unsalted broth in small splashes, stir, and taste after each addition. If that makes the soup seem thin, add a little fish sauce for savory depth, but do not add more sour mix. A small amount of sugar can soften the impression of sharp acidity, though it changes the flavor; use only a pinch if needed.

The broth tastes flat or watery. First check whether it needs salt: add fish sauce a teaspoon at a time. If the seasoning is adequate but the sourness is faint, add a little more tamarind mix or concentrate. Let the soup simmer briefly after each addition so the new flavor blends in. If you added too much water, simmer uncovered for a few minutes before adding the greens.

The pork is still chewy after 50 minutes. Continue simmering gently in 10-minute increments, checking a piece with a fork each time. Shoulder and ribs vary in size and tenderness, and a low simmer can take longer. Add water if the liquid level gets low. Do not raise the heat to a hard boil to hurry it along.

The taro is breaking down or the vegetables are mushy. The pot may have been boiling too strongly or the vegetables may have been cut smaller than the recipe calls for. Stop cooking as soon as they are tender. For a pot that is already soft, serve promptly rather than continuing to simmer; the broth will still taste good, though the texture will be less distinct.

The soup is too salty. Add hot water a little at a time and balance with more unsalted tomatoes or vegetables if you have them. Avoid adding more fish sauce or full-strength soup mix. Next time, begin with half to three-quarters of the packet, since some brands are more heavily seasoned than others.

Frequently Asked Questions

What makes sinigang sour?
Tamarind is a common souring ingredient, used as fresh pulp, concentrate or packaged sinigang mix. Some regional and household versions use other sour fruits, so the exact flavor can differ. This recipe uses tamarind mix for convenience and includes concentrate as an alternative.

Can I make sinigang without a seasoning packet?
Yes. Use tamarind concentrate a little at a time, or simmer fresh tamarind pulp in the broth and strain out the seeds and fibers. Plain tamarind is less seasoned than a packet, so adjust the saltiness separately with fish sauce or salt.

Can I use another cut of pork?
Yes. Pork ribs, pork belly or another stew-friendly cut can work. Ribs may need extra simmering, while fattier cuts make a richer broth. Cut boneless meat into even pieces and cook until tender, checking the safe minimum temperature with a thermometer.

Is sinigang supposed to be very sour?
There is no single required level. Some cooks prefer a pronounced tamarind tang, while others keep it milder. Begin with less souring mix than you think you need, taste the broth, and add more in small amounts.

Can I make the soup ahead?
Yes. Cook the pork and broth ahead, cool and refrigerate promptly, then reheat to 165°F (74°C). For the best texture, add delicate greens during reheating rather than leaving them in the soup overnight. Refrigerate within 2 hours and use the soup within 3–4 days.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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