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Thin, soft, translucent onion strips with glossy deep reddish-brown edges are gathered in a small mound.
●Low GI

Red caramelized onion Calories

Sweet and intense flavor, adds depth to dishes

In season: Spring · Summer · Autumn · Winter

CALORIES · 100 G

85kcal

GI

40low

POTASSIUM · 100 G

170mg

FIBER · 100 G

2.2g

Quick answer

1 serving (medium) of Red caramelized onion (50 g) has 43 calories. That works out to 85 calories per 100 g. It contains 9.3 g of carbs, 0.6 g of protein, 1.1 g of fat and 1.1 g of fiber. Its glycemic index is 40 (low), so it raises blood sugar slowly.

Red caramelized onion Nutrition Facts

Selected: 1 serving (medium) · 50 g

43

KCAL / 50G

Carbs

9.3g

· 3% DV

Protein

0.6g

· 1% DV

Fat

1.1g

· 1% DV

Fiber

1.1g

· 4% DV

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

Calories come from: Carbs 75% · Protein 5% · Fat 20%

Red caramelized onion nutrition facts table · 1 serving (medium) (50 g)

NutrientAmount% DV
Calories43 kcal
Total fat1.1 g1%
Saturated fat0.15 g1%
Trans fat0 g
Sodium3.5 mg0%
Total carbohydrate9.3 g3%
Fiber1.1 g4%
Protein0.6 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 Red caramelized onion?

ServingAmountCalories
1 serving (medium)50 g43 kcal
1 slice (thin)10 g9 kcal
1 tablespoon (medium)15 g13 kcal
1 slice (thick)20 g17 kcal
2 tablespoon (medium)30 g26 kcal
1 piece (small)40 g34 kcal
1 piece (large)60 g51 kcal
1 serving (large)80 g68 kcal
100 g100 g85 kcal
1 cup (chopped)120 g102 kcal

Calculated from 85 calories per 100 g.

Frequently Asked Questions About Red caramelized onion

How do you make red caramelized onion at home?

Make red caramelized onion by slicing the onion thinly and cooking it slowly in a little oil over low to medium heat. Stir occasionally and give the slices time to soften and brown; high heat can scorch them.

What can you serve with red caramelized onion?

Red caramelized onion pairs well with burgers, grilled vegetables, steak, cheese, and sandwiches. Its sweet, deep flavor also works as a topping for pizza or savory tarts, or stirred into soup.

Do you need to add sugar to red caramelized onion?

No, you do not need to add sugar to red caramelized onion. The onion’s natural sugars become sweeter as it cooks slowly; adding sugar is optional, but it can make scorching more likely.

Why is my red caramelized onion not browning?

Red caramelized onion may not brown if the pan is crowded or the heat is too low for moisture to evaporate. Cook it in a wide pan, avoid piling the slices too deeply, and keep cooking until the excess liquid is gone.

Can you caramelize red onions the same way as yellow onions?

Yes, red onions can be caramelized using the same slow-cooking method as yellow onions. Red caramelized onion tends to have a darker color and can taste fruitier, while long cooking softens the onion’s sharpness.

How long does red caramelized onion last in the fridge?

Red caramelized onion keeps for about four days in the refrigerator when stored in a covered container. Let it cool before refrigerating, then reheat it thoroughly in a pan or microwave before serving.

Can you freeze red caramelized onion?

Yes, red caramelized onion freezes well. Cool it completely, divide it into portions, and seal them in freezer-safe containers; after thawing, it may be softer, so it works best in warm dishes.

Can you add balsamic vinegar to red caramelized onion?

Yes, balsamic vinegar can be added to red caramelized onion for a tangy contrast to its sweetness. Stir in a small splash near the end of cooking and let it reduce until the onions are glossy.

What is the best way to cut red onion for caramelizing?

Slice red onion evenly from root to tip for red caramelized onion that cooks at a similar rate. Thin slices soften sooner, while slightly thicker slices hold more texture; keep the pieces consistent within a batch.

Is red caramelized onion a healthy topping?

Yes, red caramelized onion can be a flavorful topping in a balanced meal. The onion contributes flavor and some fiber, while the amount of added oil affects the finished dish; use enough to cook it without making it greasy.

Red caramelized onion Vitamins & Minerals

Vitamins

Vitamin C

3.75mg · 4% DV

B6

0.06mg · 4% DV

Folate

9µg · 2% DV

B1

0.02mg · 2% DV

Minerals

Manganese

0.07mg · 3% DV

Potassium ⭐

85mg · 3% DV

Phosphorus

16mg · 2% DV

Copper

0.02mg · 2% DV

Sodium

3.5mg · 0% DV

Red caramelized onion Glycemic Index

GLYCEMIC INDEX

40
Low
0 Low5570100

GLYCEMIC LOAD

3.5
Low

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

How to Burn Off Red caramelized onion

To burn the 43 calories in 1 serving (medium) (50 g):

🚶

11min

Walking (5 km/h)

🏃

4min

Running (8 km/h)

🚴

6min

Cycling

🏊

5min

Swimming

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

What is Red caramelized onion?

Red caramelized onion is made by slowly cooking red onion until it softens and its natural sweetness deepens. A little oil is common; some recipes also add vinegar or sugar, but neither is essential. It is a cooking preparation used across many cuisines rather than a dish tied to one particular place.

The result is tender, sweet and savoury, with a concentrated onion flavour. It works well in burgers and sandwiches, alongside grilled meat, or with cheese and savoury tarts. It is mostly a carbohydrate-containing accompaniment, so a small spoonful can add plenty of flavour without taking over a meal. For a lighter version, cook it with less oil and skip added sugar.

How Nutritious Is Red caramelized onion?

Nutrient density

Medium

45/ 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

44/ 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 Red caramelized onion Processed?

NOVA 3

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 Red caramelized 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 Red caramelized 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

Red caramelized onion Fat Profile

SATURATED

0.15g

MONOUNSATURATED

0.25g

POLYUNSATURATED

0.55g

⚖️

Omega 6:3 ratio 2:1

Below the ideal 4:1 — a good omega balance.

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Nutrition data compiled from USDA FoodData Central and scientific sources.