One small onion cooked without salt contains 0.82 grams protein, 26 calories and 0.8 grams of fiber.
Potassium - 100 mg
Phosphorus - 21 mg
Calcium - 13 mg
Iron - 0.14 mg
Magnesium - 7 mg
Sodium - 2 mg
Zinc - 0.13 mg
Copper - 0.04 mg
Manganese - 0.092 mg
Selenium - 0.4 mcg
Also contains small amounts other minerals.
Vitamin C - 3.1 mg
Niacin - 0.099 mg
Vitamin B1 (thiamine) - 0.025 mg
Vitamin B2 (riboflavin) - 0.014 mg
Vitamin B6 - 0.077 mg
Pantothenic Acid - 0.068 mg
Folate - 9 mcg
Vitamin A - 1 IU
Vitamin K - 0.3 mcg
Vitamin E - 0.01 mg
Contains some other vitamins in small amounts.
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