Red onion infused water is a very simple preparation made by steeping thinly sliced red onion in water overnight. It has a mild onion flavor and can be used as an interesting addition to a balanced diet.
While red onions contain compounds such as quercetin, soaking onion in water should not be presented as a treatment or cure for diabetes, high blood pressure, infections, or other diseases.
Recipe Overview
| Category | Details |
| Prep Time | 5 minutes |
| Soak Time | 8 hours |
| Total Time | 8 hours 5 minutes |
| Yield | 1 serving |
| Difficulty | Very Easy |
| Calories | Approximately 10–15 kcal |
Why You’ll Love This Recipe
This infusion requires only two ingredients and almost no preparation.
The result is a lightly flavored water with the characteristic taste of red onion.
If you enjoy experimenting with traditional food preparations, this is an easy recipe to try without adding sugar, artificial flavors, or commercial supplements.
Ingredients 🧅
| Ingredient | Quantity | Notes |
| 🧅 Fresh red onion | ½ medium | Washed, peeled, and thinly sliced |
| 💧 Drinking water | 1 large glass / 10 oz (300 ml) | Cool or room temperature |
| 🍋 Lemon juice | 1 teaspoon | Optional |
| 🌿 Fresh mint | 2–3 leaves | Optional |
How to Make It
Prepare the Onion
Wash the onion thoroughly.
Remove the outer skin and cut the onion in half.
Thinly slice approximately ½ of the onion.
Add the Water
Place the sliced onion into a clean glass or food-safe jar.
Pour approximately 300 ml (10 oz) of drinking water over the onion.
Make sure the onion slices are completely submerged.
Cover and Refrigerate
Cover the container with a lid or clean food-safe covering.
Place it in the refrigerator and allow it to infuse for approximately 8 hours or overnight.
Refrigeration is important because the preparation contains fresh raw produce.
Strain
The next morning, remove the container from the refrigerator.
Strain the water through a clean fine-mesh strainer.
Discard the onion slices or save them for cooking.
Add Lemon
For a more pleasant flavor, add 1 teaspoon of fresh lemon juice.
You can also add a couple of fresh mint leaves.
Serve
Serve chilled or allow it to reach your preferred temperature.
For food-safety and quality reasons, prepare only what you intend to consume promptly rather than keeping a large batch for several days.
Best Tips
Use fresh red onion: Choose an onion that is firm and free from soft or damaged areas.
Slice thinly: Thin slices expose more surface area to the water.
Always refrigerate: Because this is a raw onion infusion, refrigeration is preferable to leaving it at room temperature overnight.
Use clean equipment: Wash the glass, knife, cutting board, and onion thoroughly before preparation.
Adjust the flavor: If the onion flavor is too strong, dilute the infusion with additional drinking water.
Don’t add excessive onion: More onion does not necessarily make the drink better. It can simply make the flavor much stronger.
Best Ingredient Options
Red Onion
Choose fresh, firm red onions with dry outer skin and no soft spots.
Water
Use clean drinking water. Filtered water can be used if you prefer its taste.
Lemon
Fresh lemon juice can make the infusion considerably more refreshing.
Mint
Fresh mint adds a cooling aroma and helps balance the onion flavor.
Recipe Variations 🌿
Lemon Red Onion Infusion
Add 1–2 teaspoons of fresh lemon juice immediately before serving.
Mint & Onion Water
Add 3–4 fresh mint leaves during the final few minutes before serving.
Cucumber & Onion Infusion
Add 3–4 thin slices of cucumber to the water for a fresher flavor.
Warm Onion Infusion
If you prefer a warm beverage, gently heat the strained infusion before drinking.
Avoid bringing it to a prolonged boil.
Savory Version
Instead of treating it as a beverage, use the infused water as part of a homemade soup or broth.
What to Serve With It
If you’re having this drink as part of a meal, consider pairing it with:
- 🥚 Eggs
- 🥑 Avocado
- 🥗 A fresh vegetable salad
- 🥣 Oatmeal
- 🫘 Beans or lentils
- 🍞 Whole-grain toast
Make-Ahead Instructions
For the best freshness, prepare the infusion the night before you plan to drink it.
Keep it refrigerated throughout the soaking period.
Avoid preparing a large quantity and storing it for many days.
Storage
Because this recipe uses raw onion and water without preservatives, it is best consumed soon after preparation.
Keep the infusion refrigerated and discard any leftovers that have developed an unusual smell, appearance, or taste.
Nutrition Estimate
The nutritional contribution of the strained water is relatively small and varies according to how much onion compounds and soluble components enter the water.
| Nutrient | Approximate Amount |
| Calories | ~10–15 kcal |
| Protein | <1 g |
| Fat | <1 g |
| Carbohydrates | ~2–3 g |
| Fiber | Very low after straining |
| Added Sugar | 0 g |
If you eat the onion rather than discarding it, you’ll consume substantially more of its fiber and nutrients.
Frequently Asked Questions
Can I drink red onion water every day?
There is no established medical requirement to drink onion-infused water every day. It can be consumed as a food-based beverage if you enjoy it and tolerate it well.
Does soaking onion water cure diabetes?
No. Red onion is a nutritious vegetable, but onion-infused water is not a cure for diabetes and should never replace prescribed treatment, medication, or professional medical advice.
Does it lower blood pressure?
Red onions contain various plant compounds that are being studied for their potential health effects, but drinking onion water is not an established treatment for hypertension.
Can I use white or yellow onion?
Yes, although the flavor will be different. Red onion is preferred for this particular recipe because of its color and naturally occurring plant compounds.
Why does my onion water taste strong?
Raw onion releases flavorful sulfur-containing compounds into the water. Use fewer slices or dilute the finished infusion if you find the flavor too intense.
Can I eat the soaked onion?
Yes. Rather than throwing it away, you can add the soaked onion to a salad, sandwich, omelet, soup, or other meal.
Common Mistakes to Avoid
Leaving the infusion at room temperature overnight: Refrigerate it while it infuses.
Using damaged onions: Fresh, firm produce is preferable.
Making exaggerated health claims: Onion water is a food preparation, not a medicine.
Expecting detox effects: The body already has organs such as the liver and kidneys that process and eliminate waste.
Replacing medication with onion water: Never stop prescribed medication because of a social-media recipe.
⚠️ Important Health Note
Red onions can be part of a healthy, varied diet, but there is no reliable evidence that red onion water alone can cure or rapidly reverse a disease.
People with allergies or digestive sensitivity to onions may experience discomfort after consuming them. If you have a medical condition or take medication and are considering using concentrated food preparations regularly, consult a qualified healthcare professional.
⚠️ This recipe may not be suitable for everyone, so it is advisable to consult a doctor.
Final Thoughts
Red Onion Infused Water is an extremely simple preparation that lets you experiment with the flavor and naturally occurring compounds found in red onions.
For the greatest nutritional value, however, don’t rely on the infused water alone. Eating the whole onion provides substantially more of the vegetable’s fiber and nutrients and is a more practical way to include red onion in a balanced diet.