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Sweet, tender, antioxidant-rich
In season: Spring · Summer · Autumn · Winter
CALORIES · 100 G
GI
POTASSIUM · 100 G
FIBER · 100 G
1 piece (medium) of Baked Red Onion (80 g) has 35 calories. That works out to 44 calories per 100 g. It contains 8.1 g of carbs, 0.9 g of protein, 0.1 g of fat and 1.4 g of fiber. Its 5.6 mg of Vitamin C covers 6% of the Daily Value. Its glycemic index is 35 (low), so it raises blood sugar slowly.
Selected: 1 piece (medium) · 80 g
35
KCAL / 80G
Carbs
8.1g
· 3% DV
Protein
0.9g
· 2% DV
Fat
0.1g
· 0% DV
Fiber
1.4g
· 5% DV
DV is the share of the daily value covered, on a 2,000 kcal reference diet.
Calories come from: Carbs 88% · Protein 10% · Fat 2%
| Nutrient | Amount | % DV |
|---|---|---|
| Calories | 35 kcal | |
| Total fat | 0.1 g | 0% |
| Saturated fat | 0.02 g | 0% |
| Trans fat | 0 g | |
| Sodium | 3.2 mg | 0% |
| Total carbohydrate | 8.1 g | 3% |
| Fiber | 1.4 g | 5% |
| Protein | 0.9 g | 2% |
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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| Serving | Amount | Calories |
|---|---|---|
| 1 piece (medium) | 80 g | 35 kcal |
| 1 slice (thin) | 20 g | 9 kcal |
| 1 slice (thick) | 35 g | 15 kcal |
| 1 piece (small) | 50 g | 22 kcal |
| 100 g | 100 g | 44 kcal |
| 1 serving (medium) | 100 g | 44 kcal |
| 1 piece (large) | 120 g | 53 kcal |
| 1 serving (large) | 150 g | 66 kcal |
Calculated from 44 calories per 100 g.
To make baked red onion, peel it, cut it into wedges, and toss with olive oil, salt, and pepper. Roast in a hot oven until tender and browned at the edges, turning the pieces once for more even cooking.
Yes, you can bake a red onion whole. Leave the papery skin on to help protect the inside, place it on a tray, and roast until a knife passes through easily; peel it before serving.
Baked red onion can taste sharp if it has not cooked long enough to soften and mellow. Cut thick wedges into smaller pieces and continue roasting until tender; very dark, scorched edges can also make the flavor bitter.
No, leave baked red onion uncovered if you want browned, caramelized edges. Foil traps steam, which softens the onion but prevents much browning; cover it only if you are deliberately aiming for a softer, steamed texture.
Yes, baked red onion works well in an air fryer. Cut it into evenly sized wedges, coat lightly with oil, and cook in a single layer, shaking the basket once so the pieces brown without overcrowding.
Baked red onion pairs well with thyme, rosemary, oregano, black pepper, and a little balsamic vinegar. Add fresh herbs after roasting so they stay fragrant, or use dried herbs before cooking to season the onion throughout.
Let baked red onion cool slightly, then layer it into a sandwich with cheese, hummus, grilled vegetables, or sliced meat. Its soft texture and sweet, savory flavor work especially well with peppery greens and a tangy spread.
Yes, baked red onion can be frozen in an airtight container, though it will be softer after thawing. Use thawed portions in sauces, soups, or cooked dishes rather than expecting them to keep their original roasted texture.
Baking red onion can reduce some heat-sensitive compounds, while its natural plant pigments and other beneficial compounds do not all disappear. Roasting also makes the onion tender and flavorful, so both raw and cooked onion can fit into meals.
Yes, baked red onion is a good pizza topping. Roast it first if you want a soft, sweet result, then add it before the pizza goes into the oven; this helps prevent the onion from releasing excess moisture onto the crust.
Vitamins
Vitamin C
5.6mg · 6% DV
B6
0.1mg · 6% DV
Folate
15.2µg · 4% DV
B1
0.04mg · 3% DV
Minerals
Manganese
0.1mg · 4% DV
Copper
0.03mg · 3% DV
Potassium ⭐
117mg · 3% DV
Phosphorus
23mg · 3% DV
Sodium
3.2mg · 0% DV
GLYCEMIC INDEX
GLYCEMIC LOAD
Accounts for portion size — a more realistic measure than GI alone.
To burn the 35 calories in 1 piece (medium) (80 g):
🚶
Walking (5 km/h)
🏃
Running (8 km/h)
🚴
Cycling
🏊
Swimming
Times are calculated with the MET equation for a 70 kg adult. Actual burn varies with your weight, age and pace.
Baked red onion is made by roasting red onions until their layers turn soft and sweet. You can bake them whole, halved or in wedges, with a little oil and herbs if you like. It is a simple home-cooking preparation rather than a dish tied to one particular region, and versions appear in many cuisines.
Roasting mellows the onion’s sharpness and brings out a tender centre with lightly browned edges. Serve it alongside grilled meat or fish, fold it into salads, or add it to a tray of other roasted vegetables. It is mostly a carbohydrate source, with very little fat; a 100 g portion provides 44 calories. For a lighter result, use just enough oil to coat the onion, or roast it on baking paper.
Medium
How many vitamins, minerals and how much fiber this food carries per calorie. A high score means a lot of nutrition for few calories.
Medium
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.
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.
No known major allergens
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
SATURATED
0.02g
MONOUNSATURATED
0.01g
POLYUNSATURATED
0.02g
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.