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Thin rings and strips of onion are coated in a glossy, translucent marinade, with pale ivory centers, faint purple edges, and a few green herb flecks, piled loosely in a small serving dish.
●Low GI

Marinated Onion Calories

Onion marinated in vinegar or spices, commonly used in salads and as a garnish.

In season: Spring · Summer · Autumn · Winter

CALORIES · 100 G

45kcal

GI

35low

POTASSIUM · 100 G

120mg

FIBER · 100 G

1.7g

Quick answer

1 serving (medium) of Marinated Onion (40 g) has 18 calories. That works out to 45 calories per 100 g. It contains 3.8 g of carbs, 0.4 g of protein, 0.1 g of fat and 0.7 g of fiber. Its glycemic index is 35 (low), so it raises blood sugar slowly.

Marinated Onion Nutrition Facts

Selected: 1 serving (medium) · 40 g

18

KCAL / 40G

Carbs

3.8g

· 1% DV

Protein

0.4g

· 1% DV

Fat

0.1g

· 0% DV

Fiber

0.7g

· 3% DV

DV is the share of the daily value covered, on a 2,000 kcal reference diet.

Calories come from: Carbs 86% · Protein 9% · Fat 5%

Marinated Onion nutrition facts table · 1 serving (medium) (40 g)

NutrientAmount% DV
Calories18 kcal
Total fat0.1 g0%
Saturated fat0.02 g0%
Trans fat0 g
Sodium84 mg4%
Total carbohydrate3.8 g1%
Fiber0.7 g3%
Protein0.4 g1%

Calories: Calories measure energy. Average daily need is 2,000 kcal. Excess calories are stored as fat, too few cause weight loss.

Carbs: Your body's primary energy source. The brain runs exclusively on carbs. Daily need: 275g.

Protein: Essential for muscle repair and cell growth. Daily need: 50g. Keeps you full and boosts metabolism.

Fat: Needed for hormone production and vitamin absorption. Daily need: 78g. Limit saturated fats, choose unsaturated.

Fiber: Critical for digestive health and satiety. Daily need: 28g. Stabilizes blood sugar, lowers cholesterol.

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How Many Calories in 1 Serving of Marinated Onion?

ServingAmountCalories
1 serving (medium)40 g18 kcal
1 slice (thin)10 g5 kcal
1 tablespoon (chopped)15 g7 kcal
1 serving (small)20 g9 kcal
1 slice (thick)25 g11 kcal
1 piece (thin)30 g14 kcal
1 piece (thick)50 g23 kcal
1 serving (large)60 g27 kcal
1 cup (chopped)80 g36 kcal
100 g100 g45 kcal
1 pack (medium)100 g45 kcal

Calculated from 45 calories per 100 g.

Frequently Asked Questions About Marinated Onion

How do you make Marinated Onion?

Marinated Onion is made by tossing thinly sliced onion with vinegar, salt and optional spices, then letting it sit until the flavor mellows. Thin slices absorb the marinade faster and are easier to use as a topping.

What do you eat Marinated Onion with?

Marinated Onion works well in salads, tacos, sandwiches, burgers and grain bowls. Its sharp, tangy flavor adds contrast to rich or savory dishes, so a small amount can brighten a meal.

How long does Marinated Onion last in the fridge?

Keep Marinated Onion in a clean, covered container in the refrigerator and use a clean utensil each time. Discard it if you notice mold, an unpleasant smell or an unusual slimy texture.

Why does Marinated Onion turn pink?

Marinated Onion can turn pink when red onion pigments react with the acid in vinegar. This color change is normal and does not by itself mean the onion has spoiled.

Which vinegar is best for Marinated Onion?

Apple cider vinegar gives Marinated Onion a relatively mellow, fruity tang, while white or wine vinegar tastes sharper. Choose one you enjoy; the onion should be coated so the slices can take on the flavor.

Can you make Marinated Onion with white onions instead of red onions?

Yes, Marinated Onion can be made with white, yellow or red onions. Red onion gives a vivid color and a slightly sweeter impression, while white onion usually keeps a sharper, more pungent flavor.

How do you make Marinated Onion less pungent?

To make Marinated Onion milder, rinse the sliced onion briefly under cold water and drain it well before adding the vinegar. This removes some of the sharp surface compounds without washing away all its onion flavor.

How long should Marinated Onion sit before serving?

Marinated Onion is best given some time to absorb the vinegar and seasonings before serving. Thin slices soften and take on flavor sooner, while longer marinating makes them tangier and gradually less crisp.

Is Marinated Onion the same as pickled onion?

Not always. Marinated Onion is commonly dressed with vinegar and seasonings for use as a fresh condiment, whereas pickled onion is often preserved in brine for longer. Recipes and terminology vary, so the difference is not strict.

Can Marinated Onion cause heartburn?

Yes, Marinated Onion may trigger heartburn or stomach irritation in some people because onion and vinegar can be troublesome for sensitive stomachs. Reduce the portion or avoid it if you notice symptoms; seek medical advice if they persist.

Marinated Onion Vitamins & Minerals

Vitamins

Vitamin C

2.8mg · 3% DV

B6

0.05mg · 3% DV

Folate

7.6µg · 2% DV

B1

0.02mg · 2% DV

Minerals

Sodium

84mg · 4% DV

Copper

0.02mg · 2% DV

Phosphorus

12mg · 2% DV

Manganese

0.04mg · 2% DV

Potassium ⭐

48mg · 1% DV

Marinated Onion Glycemic Index

GLYCEMIC INDEX

35
Low
0 Low5570100

GLYCEMIC LOAD

1.2
Low

Accounts for portion size — a more realistic measure than GI alone.

How to Burn Off Marinated Onion

To burn the 18 calories in 1 serving (medium) (40 g):

🚶

4min

Walking (5 km/h)

🏃

2min

Running (8 km/h)

🚴

2min

Cycling

🏊

2min

Swimming

Times are calculated with the MET equation for a 70 kg adult. Actual burn varies with your weight, age and pace.

What is Marinated Onion?

Marinated onion is sliced onion left to soften in vinegar, often with spices or herbs. It is a simple, tangy condiment found in many food traditions rather than a dish tied to one specific origin.

Its sharp bite mellows as it marinates, making it a lively topping for salads, sandwiches, tacos, grilled meats and grain bowls. It is low in fat, with most of its carbohydrates and fibre coming from the onion itself. A small amount can add plenty of tang and crunch; for a milder version, use less vinegar or briefly rinse the onion before serving.

How Nutritious Is Marinated Onion?

Nutrient density

Medium

35/ 100

How many vitamins, minerals and how much fiber this food carries per calorie. A high score means a lot of nutrition for few calories.

Satiety score

Medium

46/ 100

An EatBetter score computed from fiber, protein and calorie density. A high score means staying full longer on the same calories.

Both scores are calculated per 100 g and do not change with the selected portion. The satiety score is EatBetter's own calculation, not a clinical measure.

Is Marinated Onion Processed?

NOVA 2

Minimally Processed

1. Unprocessed

2. Minimally Processed

3. Processed

4. Ultra-Processed

NOVA classifies foods into 4 groups by industrial processing. NOVA 1 (unprocessed) is the healthiest.

Does Marinated Onion Contain Allergens?

No known major allergens

Gluten free
Dairy free
Eggs free
Peanuts free
Tree nuts free
Fish free
Soy free
Sesame free

Which Diets Is Marinated Onion Good For?

Vegan

✓ Suitable

Vegetarian

✓ Suitable

Gluten-Free

✓ Suitable

Dairy-Free

— Not suitable

Mediterranean

✓ Suitable

Paleo

✓ Suitable

Whole30

— Not suitable

DASH

— Not suitable

Keto

— Not suitable

Low FODMAP

— Not suitable

Marinated Onion Fat Profile

SATURATED

0.02g

MONOUNSATURATED

0.01g

POLYUNSATURATED

0.01g

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Nutrition data compiled from USDA FoodData Central and scientific sources.