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Brown Onions with its crisp white flesh and papery brown skin, the brown onion's distinct, well-rounded onion flavour makes it perfect for all cooking uses. Usually too strong to be eaten raw, the brown onion should be cooked with medium to medium-high heat to bring out its sweetness. Have Many Antioxidants. Onions are low in calories yet high in nutrients, including vitamin C, B vitamins, and potassium.
Help with Blood Sugar Levels
Improved Digestive Health
Loaded with Nutrients.
Anti-Inflammatory Properties
May Keep Certain Cancers at Bay
Reduces Risks of Alzheimer's Disease
Great Source of Vitamin C

Red Onions (Spanish) are colorful and spicy-to-mild flavor. Because of their bright color and crispy texture, they're great for salads. Antioxidants. Red onions are also a good source of antioxidants. Onions are low in calories yet high in nutrients, including vitamin C, B vitamins, and potassium.
Prevents cancer
Boosts immunity
Promotes a healthy digestive system
Promotes heart health
Lower blood pressure
Improves oral health
Promotes hair growth

Spring onions have a fresh, sweet, and subtly pungent flavor well suited for both raw and cooked preparations. The bulb and leaves are edible, and the leaves will contain a stronger flavor than the mild bulb. It might act as an antioxidant.
It might have anti-cancer potential.
It might be Anti-microbial.
It might lower blood sugar levels (anti-diabetic)
It might be anti-inflammatory.
It might have cholesterol-lowering activity (anti-hyperlipidaemic)
It might be helpful for asthma (anti-asthmatic)

White onions offer several health benefits, including supporting heart health, boosting immunity, and aiding digestion. They are rich in antioxidants, including quercetin, which can help reduce inflammation and protect against chronic diseases. Additionally, white onions contain vitamin C, B vitamins, and potassium, all essential for various bodily functions.