Sinigang na Salmon: A Practical Step-by-Step Recipe

Sinigang na salmon is a Filipino sour soup made with salmon, vegetables, and a tangy broth, commonly flavored with tamarind. Serve it hot with steamed rice; ingredients and sourness vary by region and household. This version uses a convenient tamarind soup mix, with fresh tamarind as an option, and cooks the salmon gently so it stays tender.

What You’ll Need

1½ lb (680 g) salmon, cut into 4 portions; skin on or off
8 cups (1.9 L) water, divided
1 medium yellow onion (about 6 oz/170 g), peeled and cut into wedges
2 medium tomatoes (about 10 oz/280 g), cut into wedges
1 packet (about 1.4 oz/40 g) tamarind sinigang soup mix, or an amount appropriate to its package directions
1 small daikon radish (about 8 oz/225 g), peeled and sliced ¼ inch (6 mm) thick
6 oz (170 g) green beans, trimmed and cut into 2-inch (5 cm) lengths
1 small eggplant (about 8 oz/225 g), cut into 1-inch (2.5 cm) pieces
2 cups (about 2 oz/55 g) fresh spinach, or 2 cups (about 60 g) water spinach (kangkong), if available
1–2 Thai bird’s-eye chiles, whole or slit, optional
1 tablespoon (15 ml) fish sauce, plus more to taste
Steamed rice, to serve

Tamarind soup mix is widely available at Asian grocers and gives a reliable sour broth. For a less processed, adjustable alternative, simmer 8 oz (225 g) fresh tamarind pods in 2 cups (475 ml) water for about 10 minutes until soft, mash and strain, then add the liquid gradually; you may need more than one batch to reach the desired tang. Water spinach is traditional in many versions but can be hard to find; spinach is a quick-cooking substitute with a softer texture.

Step-by-Step

Prepare the ingredients. Cut the onion and tomatoes into wedges, slice the daikon, trim and cut the beans, and chop the eggplant. Keep the salmon chilled until needed. If using frozen salmon, thaw it in the refrigerator rather than on the counter and pat it dry before cooking.
Start the broth. Add 7 cups (1.65 L) water, onion, tomatoes, and the optional chiles to a large pot. Bring to a boil over high heat, then reduce to a steady simmer. Cook for 5 minutes, pressing the tomatoes lightly with a spoon to release their juices.
Season it sour. Stir in the tamarind soup mix until dissolved, following the packet’s directions if they differ. Add 1 tablespoon (15 ml) fish sauce. Simmer for 2 minutes, then taste carefully. Add some or all of the remaining 1 cup (240 ml) water if the broth tastes too concentrated. The finished soup should be noticeably tart and savory, not salty or harsh.
Cook the firm vegetables. Add the daikon and simmer for 6–8 minutes, until it is nearly tender but not falling apart. Add the green beans and eggplant. Simmer for another 4–5 minutes, until the beans are bright and crisp-tender and the eggplant is just soft.
Add the salmon gently. Lower the salmon portions into the simmering broth in a single layer. Keep the liquid at a gentle simmer rather than a rolling boil, which can break up the fish. Cook about 5–8 minutes, depending on thickness, turning the pieces only if needed. Check the thickest part with a food thermometer: USDA FSIS sets the safe minimum internal temperature for fish at 145°F (63°C). The flesh should also look opaque and separate easily with a fork.
Finish and serve. Stir in the spinach or water spinach and cook for about 1 minute, just until wilted. Taste the broth and adjust with a little more fish sauce for savoriness, water to soften the sourness, or a small additional amount of tamarind mix for more tang. Serve promptly in bowls with steamed rice.

Common Mistakes

Boiling the salmon hard: Vigorous boiling can make salmon dry and cause it to break apart. Keep the broth at a gentle simmer after adding the fish.
Adding all the sour seasoning without tasting: Soup-mix strength varies by brand, and the packet may be intended for a different volume of water. Start with the stated amount for this recipe, taste, and dilute or adjust gradually.
Overcooking the vegetables: Adding greens and soft vegetables too early makes them mushy. Cook daikon first, then beans and eggplant, and add leafy greens at the end.
Relying on appearance alone: Salmon color and texture are not dependable temperature checks. Use a food thermometer and confirm 145°F (63°C) at the thickest part.
Using salmon with a strong off odor: Fresh fish should smell mild, not sour or ammonia-like. Keep raw fish refrigerated and discard it if it seems spoiled.

Tips

Choose salmon portions of similar thickness so they finish at about the same time. Center-cut pieces are easier to cook evenly than very thin tail pieces.
For a clearer broth, avoid stirring once the salmon is in the pot. Ladle broth over the fish instead if the tops need moistening.
Start with whole chiles for gentle heat; slit them or add more only if you want a hotter soup. Remove them before serving if preferred.
Season at the end as well as the beginning. Fish sauce adds salt, and simmering concentrates the broth, so final adjustments are more accurate once the vegetables and fish are cooked.
Have rice ready before the fish goes into the pot. Salmon cooks quickly, and the soup is best served soon after it is done.

Troubleshooting

The broth is too sour: Stir in hot water a little at a time, then taste again. Add a small amount of fish sauce if dilution makes it taste flat.
The broth is too mild: Dissolve a little more tamarind mix in a ladle of hot broth before returning it to the pot, or add strained tamarind liquid. Adjust in small increments.
The soup is too salty: Add water and, if needed, a little extra tomato or unsalted vegetables. Do not add more fish sauce or soup mix until you taste it again.
The salmon is not yet at temperature: Keep the pot at a gentle simmer and check again after 1–2 minutes. Avoid repeatedly lifting and turning the pieces.
The salmon has overcooked or broken apart: It cannot be made tender again, but serve it carefully with a ladle and avoid further simmering. Next time, add it later and begin checking the temperature at the early end of the cooking range.

Frequently Asked Questions

Can I use frozen salmon?
Yes. Thaw it overnight in the refrigerator, or use a sealed package in cold water and cook it promptly. Do not thaw fish at room temperature.

Can I use salmon steaks or a whole salmon head?
Yes. Steaks and head portions work, but bone-in pieces may need a little longer. Check the thickest edible portion with a thermometer and take care of small bones when serving.

What can I use instead of sinigang mix?
Use strained tamarind liquid from softened fresh pods, adding it gradually until the broth is pleasantly tart. Tamarind concentrate can also work; check its strength and dilute it according to its label.

Can I make sinigang na salmon ahead?
You can prepare and refrigerate the broth and vegetables ahead, then bring them to a simmer and cook the salmon just before serving. This helps prevent the fish from becoming dry when reheated.

How should I store and reheat leftovers?
Refrigerate leftovers within 2 hours in a covered container and use within 3–4 days. Reheat soup to 165°F (74°C), checking with a food thermometer; warm gently and avoid repeated reheating, which can toughen the fish.

Is sinigang always made with tamarind?
Tamarind is a common souring ingredient, but versions differ. Other souring ingredients, including calamansi or green mango, may be used depending on local availability and household preference.

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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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