Overview

Argentine Submarino

Name: Argentine Submarino
Prep time: 5 min
Cook time: 10 min
Total time: 15 min
Cuisine: Argentina
Ingredients: 500ml (2 cups) Whole milk; 50g (2 small bars) Dark chocolate bar; 10g (2 tsp) Granulated sugar; 1g (a pinch) Ground cinnamon

Submarino, Hot Chocolate with a Chocolate Bar

The Argentine submarino is a Buenos Aires cafe classic: a tall glass of steaming hot milk served with a bar of chocolate that sinks into it like a submarine, then melts as you stir. It is the drink of a slow afternoon in a confiteria, always with a medialuna on the side. One serving is about 288 g.

The submarino is a fixture of Buenos Aires cafe culture: a tall glass of hot milk served with a bar of chocolate, traditionally an Aguila bar, that the drinker sinks into the milk and stirs until it melts. The name comes from the way the bar sinks like a submarine. It is the classic order of the merienda, the Argentine afternoon tea, and it is almost always served with medialunas, the small croissants of Buenos Aires.

Pairs well with: Serve with medialunas and a spoon for stirring, in a tall glass set in a metal holder.

Provenance

Argentina

Buenos Aires Cafe Classic

Latin America & Caribbean

Time Dedication

15m

5m prep • 10m cook

Batch Yield

2 Servings

309 kcal per serving

1 serving ≈ 288 g

Technical Skill

Easy

Easy (Stovetop Drink)

Meal Timing & Digestive Fit

Breakfast

Not Advised

Lunch

Inappropriate

Dinner

Inappropriate

Snack & Tea

Ideal Light Bite

Occasions: Afternoon tea, cafe breaks, cold evenings, after-school snacks Cost: Low — about $1.50 per serving at home

Tags: Sweet Rich Vegetarian

An Argentine submarino: a tall glass of hot milk in a metal holder with a chocolate bar melting into it, a spoon resting in the glass

Buenos Aires Cafe Classic

Photo: Beatrice Murch, CC BY-SA 2.0, via Wikimedia Commons

The Heritage Formulary

Measured Ingredients

Whole milk 500ml (2 cups)

250 ml (1 cup) per glass. Substitute: Semi-skimmed milk, same amount, for a lighter drink; oat milk for a dairy-free version.

How to choose: Fresh pasteurised whole milk, well within date, kept cold

How to prepare: Pour into a small saucepan

Required
Dark chocolate bar 50g (2 small bars)

25 g per glass; a plain bar, about 50% cocoa. Substitute: Milk chocolate, same weight, for a sweeter, milder drink.

How to choose: A plain dark chocolate bar that snaps cleanly; avoid bars with nuts or fillings

How to prepare: Keep the bar whole — it sinks and melts as one piece

Required
Granulated sugar 10g (2 tsp)

Optional, to taste. Substitute: Leave it out entirely; the chocolate sweetens the milk on its own.

How to choose: Fine white sugar that dissolves quickly

How to prepare: Measure out and keep beside the pan

Optional
Ground cinnamon 1g (a pinch)

Optional garnish on top. Substitute: A little cocoa powder dusted on top.

How to choose: Fragrant, reddish-brown cinnamon, not faded

How to prepare: Measure out a pinch

Optional

Estimated cost: Low — about $1.50 per serving at home (USD)

This recipe follows the classic Buenos Aires method: a whole chocolate bar sunk into a tall glass of steaming hot milk and stirred until it melts.

Execution Methodology & Culinary Technique

Step-by-Step Cooking Guide

Active 15m

Prep Stage: Set Out the Glasses and the Chocolate

5 Mins

Set out two tall glasses in metal holders or heatproof mugs, and a long spoon for each glass. Measure the milk into a small saucepan, keep the two chocolate bars whole, and put the sugar and cinnamon beside the stove so everything is within reach when the milk is hot.

Maestro Tip: Use a tall glass if you have one: the bar needs depth to sink and melt properly, and the glass shows the chocolate swirling in.

1
Heat the Milk Until Steaming

5 Mins Medium heat, milk heated to about 80°C (175°F)

Pour the milk into a small saucepan and heat it over medium heat, stirring now and then, until it is steaming and just about to simmer, about 80°C (175°F). Do not let it boil. If you are adding sugar, stir it into the hot milk now until it dissolves.

Stir as you heat: milk scorches on the bottom of the pan in seconds if it sits still.

Done when: The milk is steaming, with small bubbles forming around the edge of the pan, but it is not boiling.
2
Pour the Milk into the Glasses

1 Min Milk about 80°C (175°F)

Pour the hot milk into the two tall glasses, filling each one about three-quarters full. Set the glasses in their metal holders or on saucers.

Warm the glasses first with a splash of hot water so the cold glass does not cool the milk.

Done when: Two glasses of steaming milk, ready for the chocolate.
3
Sink the Chocolate Bar

2 Mins No extra heat — the hot milk melts the bar, about 80°C (175°F)

Drop one whole chocolate bar into each glass. The bar sinks to the bottom like a submarine — that is where the drink gets its name. Leave it for a minute so the heat starts to melt it.

Do not break the bar up: a whole bar melts slowly and gives you the full submarino moment.

Done when: The bar has sunk to the bottom of the glass and its edges are starting to soften and melt.
4
Stir Until Smooth and Serve

2 Mins Serve hot, about 70°C (158°F)

Stir slowly with a long spoon until the chocolate has melted completely and the milk turns a smooth, even chocolate colour. Keep stirring until no dark streaks remain and the drink is glossy and hot.

Stir gently and steadily: vigorous stirring cools the drink and makes it frothy rather than smooth.

Done when: The milk is evenly coloured, glossy, and hot through, with no chocolate streaks left.

Finishing Touches & Plating

Serve the submarino at once, while the chocolate is still melting, with a spoon for stirring and a medialuna or two small biscuits on the saucer.

Nutritional Physiology & Benefits

Nutrition

Energy

309

kcal / serving

Protein

10g

Complete AA

Carbs

33g

Complex

Fats

16g

Healthy

Per serving (2 servings · 1 serving ≈ 288 g)
Energy	309 kcal
Protein	10 g
Carbohydrates	33 g
Fat	16 g
Fibre	1.7 g
Sugar	30.1 g
Sodium	113 mg

Per 100g
Energy	107 kcal
Protein	3.3 g
Carbohydrates	11.5 g
Fat	5.5 g
Fibre	0.6 g
Sugar	10.5 g
Sodium	39 mg

Nutrition values are estimated — calculated from USDA FoodData Central values for the listed ingredients.

Vitamins & minerals: Calcium and vitamin B12 (milk), iron and magnesium (dark chocolate). Nutrition values are estimated.

Protein and Calcium

About 9.5 g of protein per glass from the milk, plus calcium for bones and teeth.

Afternoon Energy

About 309 kcal a glass, with 33.0 g of carbohydrate for quick energy — the classic Argentine afternoon lift.

Simple and Honest

Made from just milk, chocolate and a little sugar, with no syrups or powders, when the milk is pasteurised and fresh.

Food Pairings

What to Eat With

To optimize nutrient absorption and elevate the sensory depth, pair with these authentic accompaniments:

Sides

Medialunas

Buttery, flaky medialunas are the classic partner: their sweetness matches the chocolate and they are made for dunking.

Butter Biscuits

A couple of small butter biscuits on the saucer give something crisp to nibble while the chocolate melts.

Fresh Orange Slices

A few slices of fresh orange cut through the richness and refresh the palate after a sweet drink.

Drinks

Cafe con Leche

A strong coffee alongside is the other half of a Buenos Aires merienda, balancing the sweetness of the milk.

Full Menus

Full Menu: Merienda with Submarino

Order a submarino with medialunas for a classic Buenos Aires merienda, after a light lunch and before dinner.

Complete menu

Order a submarino with medialunas for a classic Buenos Aires merienda, after a light lunch and before dinner.

Digestive Guardrails

What NOT to Combine

To prevent digestive distress, sluggishness, or palate clash, avoid pairing the dish with these elements:

Boiling the Milk

Milk boils over in seconds and scorches on the bottom of the pan, which gives the whole drink a burnt taste. Heat it gently and watch it the whole time. This is general information, not medical advice.

Adding the Bar to Lukewarm Milk

A chocolate bar dropped into lukewarm milk melts into a greasy streak instead of a smooth drink. The milk must be steaming hot, about 80°C (175°F), before the bar goes in. This is general information, not medical advice.

General information only, not medical advice — consult a doctor for personal dietary decisions.

Who Should Eat It

Who Should Eat

General adultsA rich cafe drink as written; one glass is a filling afternoon snack for most adults.
ChildrenSuitable from age 5+ in a smaller glass; use half a chocolate bar and let the milk cool a little before serving.
ElderlyGood in a small glass; serve it warm rather than very hot, and take care with the hot glass.
Pregnant womenGenerally suitable when made with pasteurised milk; the caffeine in a dark chocolate bar is small. Ask your clinician about portion size.
Breastfeeding womenGenerally suitable; the milk supplies calcium and the chocolate is a small treat. Ask your clinician if you are limiting caffeine.
AthletesA pleasant recovery drink: about 9.5 g of protein and 33.0 g of carbohydrate per glass from the milk and chocolate.
Weight gainA good choice: a full glass with a medialuna adds energy easily, and the milk and chocolate are filling.
Weight lossKeep to one small glass, use semi-skimmed milk, and skip the extra sugar; the drink is sweet enough from the chocolate alone.

Health Conditions — Adjust or Avoid

Conditions

DiabetesOne glass has about 33.0 g of carbohydrate and 30.1 g of sugar; a half glass with no added sugar is a safer portion. Ask your clinician about portions.
High blood pressureOne glass has about 113 mg of sodium, which is low; the sugar is the bigger concern, so skip the extra sugar. Ask your clinician about your daily sugar intake.
Kidney diseaseMilk and chocolate are both fairly high in potassium and phosphorus, so keep to a small glass if your clinician has advised limits, and ask about portion size.
GoutMilk and chocolate are low in purines, so this drink is generally a safe choice. Ask your clinician if you are unsure.
Stomach issuesHot milk and rich chocolate can be heavy for a sensitive stomach; a smaller glass, sipped slowly and not too hot, is usually easier. Ask your clinician if symptoms persist.
Cardiovascular diseaseWhole milk and chocolate add saturated fat; use semi-skimmed milk and a darker chocolate bar to lighten the drink. Ask your clinician about your overall fat intake.
Fatty liverThe sugar in this drink adds up quickly; skip the added sugar and keep to one small glass. Ask your clinician about dietary changes.
Food allergiesContains milk. The chocolate bar may contain soy lecithin and traces of nuts; check the wrapper. Ask your clinician before serving to someone with a food allergy.
Special therapeutic dietsSuitable as written for vegetarian and gluten-free diets. For a dairy-free version, use oat milk, though the flavour changes. Ask your clinician or dietitian before adapting it.

If you have a medical condition, consult your doctor before changing your diet.

Storage & Use

How to store: Make fresh and serve immediately; leftover milk can be kept in the fridge for 1 day and reheated to 74°C (165°F).
In the fridge: Do not store; make only as much as you will drink straight away.
In the freezer: Not recommended; milk and chocolate separate when frozen and thawed.
How to reheat: Reheat leftover milk in a pan over medium heat until steaming, to 74°C (165°F); add a fresh chocolate bar.
Freezing recommended: No, this is a drink to make fresh and drink at once.
Signs it has spoiled: Sour smell, curdled milk, or milk past its use-by date.

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