Colombian Fermented Milk Dip (Suero Costeño)

Name: Colombian Fermented Milk Dip (Suero Costeño)
Prep time: 15 min
Cook time: 15 min
Total time: 30 min
Cuisine: Colombia
Ingredients: 4 cups (960 ml) whole milk; 1 teaspoon (6 g) fine sea salt, plus more to taste; 2 tablespoons (30 ml) buttermilk, plain live-culture yogurt, or 3 tablespoons (45 ml) suero from a previous batch; 2 tablespoons (30 ml) heavy cream, optional, for a richer dip

Suero costeño Say it: SWEH-roh kohs-TEH-nyoh

By the Passport Plate editors. Published November 5, 2026.

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Suero costeño is the tangy, thick fermented milk of Colombia's Caribbean coast, somewhere between sour cream and a drinkable yogurt. Cooks there keep a clay pot or glass jar going for days, letting warm milk and salt sour gently until it is spoonably thick and bright on the tongue. It is the everyday table condiment of the coast: ladled over rice, dolloped onto soups, and, most of all, used as a dip for hot fried food. Mild, creamy and refreshing, it cools what it touches.

Colombian Fermented Milk Dip (Suero Costeño)

Suero costeño

Pronounced SWEH-roh kohs-TEH-nyoh

Serves: 4
Prep: 15 min
Cook: 15 min
Total: 30 min
Level: Easy

Also nut-free and egg-free.

Allergens: contains milk. Check labels on packaged ingredients.

Ingredients

4 servings

4 cups (960 ml)960 ml (4 cups) whole milk
1 teaspoon (6 g)6 g (1 teaspoon) fine sea salt, plus more to taste
2 tablespoons (30 ml)30 ml (2 tablespoons) buttermilk, plain live-culture yogurt, or 3 tablespoons (45 ml) suero from a previous batch
2 tablespoons (30 ml)30 ml (2 tablespoons) heavy cream, optional, for a richer dip

Method

Warm the milk in a heavy saucepan over medium heat until it steams and small bubbles ring the edge, about 180°F (82°C). Do not let it boil.
Take the pan off the heat, stir in the salt, and let the milk cool until it feels just warm on your wrist, roughly 100–110°F (38–43°C).
Whisk in the buttermilk, yogurt or reserved suero, and the cream if using, until completely blended with no streaks.
Pour into a clean glass jar or clay pot, cover loosely with a cloth or a lid set ajar, and leave in a warm spot at 75–85°F (24–29°C).
Let it stand 12–24 hours, until it has set to the thickness of sour cream and smells pleasantly sour, not sharp or bitter.
Refrigerate at least 4 hours or overnight; it firms up further as it chills.
Whisk briefly to smooth it out, taste, and add a pinch more salt if the flavour needs lifting.
Spoon into a small bowl and serve cold as a dip.

Regional variants

Some coastal cooks stir in a spoonful of heavy cream or a little mayonnaise for a denser dip, while others fold in chopped cilantro, scallion or a dash of hot sauce before serving.

Cook's notes

Keep everything scrupulously clean and use milk that is as fresh as possible; a warm, draught-free corner of the kitchen gives the most reliable set.
In cool weather, set the jar in an oven with only the light on, or in a yogurt maker, and check after 12 hours.
Reserve 3 tablespoons (45 ml) of each finished batch to start the next one, the way coastal cooks keep their pot going.

Serve with

Patacones, arepas, fried yuca or plantain chips, and as a cooling partner to grilled fish, chicken and rice.

Make ahead and storage

Keeps tightly covered in the refrigerator for up to 2 weeks; stir before each use and start a fresh batch from the last spoonful.

Colombian Fermented Milk Dip (Suero Costeño)