Vietnamese Caramelised Fish in a Clay Pot
This ca kho to recipe is Vietnamese clay-pot fish: thick catfish steaks braised low and slow in coconut water with a dark caramel, fish sauce, shallots and ginger, until the sauce reduces to a sticky glaze. It is a different dish from ga kho gung, the ginger-braised chicken — ca kho to is built on fish and caramel, not on chicken and fresh ginger, and the clay pot is what gives it its gentle, even heat. One serving is about 425 g.
Ca kho to is home cooking from the Mekong Delta, where the clay pot — the to — has been the everyday cooking vessel for generations. Fish from the river, caramelised sugar, coconut water and fish sauce are the Delta's pantry staples, and the slow braise turns them into a dark, sticky sauce that begs for rice. The dish is a cousin of ga kho gung, the ginger-braised chicken, but the two are not the same: ca kho to is built on fish and caramel, while ga kho gung is built on chicken and fresh ginger.
Pairs well with: Steamed jasmine rice, cucumber and pickled mustard greens
Provenance
Vietnam
Mekong Delta Home Cooking
East & South Asia
Time Dedication
1h 10m
20m prep • 50m cook
Batch Yield
4 Servings
488 kcal per serving
1 serving ≈ 425 g
Technical Skill
Intermediate
Intermediate (Clay-Pot Braising)
Meal Timing & Digestive Fit
Breakfast
Not Advised
Lunch
Hearty Midday Main
Dinner
Ideal Hearty Main
Snack & Tea
Inappropriate
Mekong Delta Home Cooking
Photo: Binh Giang, Public domain, via Wikimedia Commons
The Heritage Formulary
Estimated cost: Low — about $3–4 per serving at home (USD)
A good ca kho to is judged by the glaze: dark, glossy and sticky, with fish that flakes but does not fall apart.
Execution Methodology & Culinary Technique
Prep Stage: Season the Fish, Make the Caramel
20 Mins • Seasoning & Caramel
Season the catfish steaks with a little fish sauce and pepper and leave them for 15 minutes so the salt firms the flesh. While they rest, slice the shallots, garlic, ginger and chilli, and have the coconut water measured out — once the caramel turns amber, everything has to go in fast.
Maestro Tip: Dry the fish well before it meets the pot — wet fish steams instead of searing and breaks apart.
15 Mins Room temperature, 20°C (68°F)
Pat the catfish steaks dry, rub them with 1 tablespoon of the fish sauce and the black pepper, and leave for 15 minutes.
The salt firms the flesh so the steaks hold together in the pot.
Done when: The surface is dry and seasoned.
5 Mins Medium heat, about 160°C (320°F)
Warm the oil in the clay pot, add the sugar and stir until it melts, then keep cooking — without stirring — until it turns a deep amber, the colour of dark honey. This takes about 3 minutes; watch it closely.
Dark amber is the target — pale caramel tastes only sweet, burnt caramel tastes bitter.
Done when: The caramel is deep amber and smells like toffee.
5 Mins Medium heat, about 160°C (320°F)
Add the shallots, garlic and ginger to the caramel and stir for 1 minute, then lay the fish steaks in the pot in a single layer. Sear for 2 minutes per side so the outside firms up.
Do not move the fish while it sears — it will stick and break.
Done when: The outside is lightly browned and the steaks hold their shape.
35 Mins Low simmer, about 95°C (200°F); fish to 63°C (145°F)
Pour in the coconut water and the rest of the fish sauce, add the chilli, and bring to a gentle simmer. Cover and braise on the lowest heat for 30 minutes, turning the steaks once halfway, until the fish flakes easily and reaches 63°C (145°F) inside.
A bare simmer is enough — boiling breaks the fish apart.
Done when: The fish flakes with a fork and the sauce has thickened.
10 Mins Low simmer, about 95°C (200°F); serve hot, 60°C (140°F) or hotter
Lift the lid for the last 5 minutes so the sauce reduces to a dark, sticky glaze that coats the fish. Scatter over the spring onions and serve straight from the pot with steamed rice.
The sauce should coat a spoon, not run like water.
Done when: The glaze is dark and glossy; the fish is tender and intact.
Finishing Touches & Plating
Serve it from the clay pot while it is still bubbling gently — the fish should be tender enough to flake with a spoon, the sauce dark and sweet-salty, and the rice there to soak up every drop.
Nutritional Physiology & Benefits
Energy
488
kcal / serving
Protein
38g
Complete AA
Carbs
58g
Complex
Fats
10g
Healthy
| Energy | 488 kcal |
| Protein | 38 g |
| Carbohydrates | 58 g |
| Fat | 10 g |
| Fibre | 1.3 g |
| Sugar | 12.6 g |
| Sodium | 987 mg |
| Energy | 115 kcal |
| Protein | 9 g |
| Carbohydrates | 13.7 g |
| Fat | 2.3 g |
| Fibre | 0.3 g |
| Sugar | 3 g |
| Sodium | 232 mg |
Nutrition values are estimated — calculated from USDA FoodData Central values for the listed ingredients.
Vitamins & minerals: Vitamin B12 and vitamin D (catfish), vitamin C (spring onions, chilli), potassium (coconut water), selenium (fish).
High in Protein
Each serving gives about 36 g of protein from the catfish, which makes this a filling dinner rather than a light starter.
B12 and Vitamin D from Fish
Catfish is a good source of vitamin B12 and vitamin D, which the body uses for energy and bone health.
Gentle, Slow Cooking
The clay pot's low, even heat cooks the fish gently, so it stays moist and tender instead of drying out.
Food Pairings
To optimize nutrient absorption and elevate the sensory depth, pair with these authentic accompaniments:
Sides
Steamed Jasmine Rice
Plain rice is essential — it soaks up the dark caramel sauce, which is the best part of the dish.
Pickled Mustard Greens
Sour, crunchy pickled greens are the classic Mekong Delta partner — their acidity balances the caramel.
Vegetables
Cucumber Slices
Cool, crisp cucumber cuts the sweet-salty richness and refreshes the palate.
Drinks
Unsweetened Iced Tea
Cold, unsweetened tea cleanses the palate after the rich, sticky sauce.
Complete menu
Serve the fish straight from the clay pot with steamed rice, cucumber slices and pickled mustard greens.
Digestive Guardrails
To prevent digestive distress, sluggishness, or palate clash, avoid pairing the dish with these elements:
Eating It Undercooked
Fish must reach 63°C (145°F) inside and flake easily; undercooked fish is a food-safety risk. Use a thermometer, not guesswork. This is general guidance, not medical advice.
Boiling It Hard
A hard boil breaks the fish into flakes and clouds the sauce — keep it at the gentlest simmer and let the pot do the work.
General information only, not medical advice — consult a doctor for personal dietary decisions.
Who Should Eat It
Health Conditions — Adjust or Avoid
If you have a medical condition, consult your doctor before changing your diet.
Storage & Use
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Comfort & Sustained Energy
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WARNING: This dish is made from raw duck blood and eating it is NOT recommended. Raw blood can carry Streptococcus suis (which causes meningitis and sepsis — people in Vietnam have died after eating pig-blood tiet canh), avian influenza from duck blood, salmonella and other dangerous germs. Vietnam's Ministry of Health advises against eating tiet canh, and no preparation method — not even blood from a fresh or trusted source — makes raw blood fully safe. This page describes the traditional Hanoi preparation, tiết canh vịt, for cultural knowledge only. One serving is about 241 g: a small bowl of fresh duck blood mixed with fish sauce, poured over finely chopped cooked duck meat and left to set into a soft, trembling jelly, then finished with crushed roasted peanuts, fresh herbs, lime and chili, and served cold.
Cultural Discovery
A traditional northern Vietnamese snack of raw duck blood set into a soft jelly with cooked duck meat, herbs and peanuts — described here for cultural knowledge, with a serious safety warning.
