Onion Skins Powder

• 0.025 kg Onion skins (about 4 to 5 cups, from 6 to 6 medium onions).

1. 1 Collect peels, discarding dirty or unusable bits.
2. 2 Soak in water for 30 minutes, rinse, and thoroughly pat dry with a clean cloth.
3. 3 Dehydrate:
4. 4 Oven: spread peels on a parchment-lined baking sheet. Set the oven to its lowest setting (approx. 50 to 60 °c and dry for 3 hours.
5. 5 Dehydrator: place in a single layer and follow machine recommendations until brittle.
6. 6 Once completely dry and brittle, place peels into a blender or coffee grinder, and pulse until a fine powder is formed.
7. 7 Storage: store in an airtight container in a cool, dry place for up to 6 months.
8. 8 Nutritional Highlights: massive concentration of quercetin: the outer skin layers can contain over a dozen times more quercetin—a powerful flavonoid and anti-inflammatory antioxidant—than the fleshy inner layers of the onion. Anthocyanins (red onions): if you use the skins of red onions, the powder will be rich in anthocyanins, which provide vibrant colour and are excellent for combating free radicals and supporting the immune system.
9. 9 High dietary fibre: onion skins pack a much higher concentration of dietary fibre than the inner parts of the bulb. Fibre promotes healthy digestion, satiety, and helps stabilise blood sugar.
10. 10 Bioactive phenolic compounds: the powder is rich in phenolic acids and glycosides, which carry natural antimicrobial and anti-inflammatory properties. Studies show these compounds can contribute to heart health and protect against oxidative stress.
11. 11 Low in calories: it provides a dense, punchy flavour profile without adding significant calories, making it a perfect low-sodium substitute for table salt.

Sustainability impact

Wasted avoided: onion skins. By-product used: onions skins. Valorisation strategy: valorise onion skins by transforming them into a highly potent, nutrient-dense culinary powder. Rich in dietary fibre, fructooligosaccharides, and the antioxidant quercetin, you can transform onion peels into a flavourful powder by dehydrating and blending crisp skins. This creates a potent zero-waste seasoning to boost everyday meals. Circular economy principle: transforming discarded onion skins into onion peel powder is a highly practical way to apply circular economy principles in your kitchen. It redefines food waste as a raw material, keeping organic nutrients in the human consumption loop, lowering landfill volume, and replacing synthetic food additives with natural alternatives.