Apple Scrap Vinegar (Sirka) at Home: Peels, Cores and Safety
You can make apple scrap vinegar at home from peels, cores, water and a little sugar in 3 to 6 weeks, but one rule comes before the recipe: nobody knows how strong homemade vinegar is, so it must never be used for canning or long-keeping achar, and it must always be diluted before you drink it. Here’s how to make it, how to tell a healthy “mother” from mould, and where it’s safe to use.
First, the safety rule: you can’t know its strength
Shop vinegar is made to a set acidity, usually 4 to 5% acetic acid, and the label tells you so. Preserving recipes depend on that number. Homemade scrap vinegar might end up at 5%, or it might stall at 2 or 3%, and there’s no way to tell by taste or smell, because a weak vinegar and a strong one can both make you pull a face. Nobody at home can measure it.
Why does that matter? In a jar of achar or preserved vegetables meant to sit in the cupboard for months, a weak vinegar may not be sour enough to stop spoilage, and in sealed jars it can let dangerous bacteria grow, including the kind that causes botulism. You can’t see, smell or taste that. So the rule is simple:
- Yes: salad dressings, chutneys, marinades, sirke wale pyaz and quick pickles kept in the fridge and eaten within 1 to 2 weeks, and household cleaning.
- No: canning, bottled preserves and any achar meant to keep for months. Use shop vinegar with a stated acidity for those, and see our achar safety guide.
Our main sirka guide compares desi cane vinegar with apple cider vinegar and covers how much to dilute before drinking. This article is about the scrap version only.
In brief
- You need: scraps of 6 to 8 apples, 1 litre water, 4 tbsp sugar, a 1.5-litre glass jar, a cloth
- Stage 1: 1 to 2 weeks, stirring daily (sugar turns to alcohol)
- Stage 2: 2 to 4 weeks, left alone (alcohol turns to vinegar)
- Keeps: many months in a capped bottle in a dark cupboard
- Bin it if: fuzzy spots of any colour, or a rotten smell
Prefer to listen? This post as a 5 min video · Video page with transcript
How to make apple cider vinegar at home from scraps
A quick naming note. True apple cider vinegar starts from pressed apple juice. Scrap vinegar is its thrifty cousin, made from the bits you’d throw away, and it tastes lighter and fruitier. It works the same way.
- Wash the apples before peeling. Rub them under warm running water. Shop apples often carry a wax coating, and peel holds most of any spray residue, so organic or home-grown apples are best. Our guide to waxed apples explains the coating.
- Collect the scraps. You want the peels and cores of 6 to 8 apples, about 300 to 400 g. Knock out the seeds. Bruised bits are fine; rotten or mouldy bits are not. Scraps keep in a box in the fridge for 3 or 4 days while you collect.
- Make the sugar water. Stir 4 tbsp (about 50 g) sugar into 1 litre of boiled and cooled water until it dissolves. Boiling drives off the chlorine that can slow the yeasts.
- Fill the jar. Put the scraps in a clean 1.5-litre glass jar and pour the sugar water over them. Leave at least 5 cm of space at the top.
- Keep everything under. Weigh the scraps down with a small glass bowl or a zip bag of water. Any piece poking above the liquid is where mould starts.
- Cover with cloth, not a lid. Tie a muslin cloth or two layers of kitchen paper over the mouth with a rubber band. Air must get in, and fruit flies must not.
- Stage 1: stir daily. Keep the jar somewhere dark at 20 to 30 °C. Stir once a day with a clean steel or wooden spoon for 1 to 2 weeks. It will bubble and smell like cider.
- Strain. When the bubbling slows and most scraps have sunk, strain out the solids, squeeze them, and pour the liquid into a clean jar. Cover with cloth again.
- Stage 2: leave it alone. Two to four weeks, no stirring. A mother usually forms on top. Start tasting after 2 weeks: dip a clean spoon, dilute a few drops in water and taste. It’s ready when it’s clearly sour with no sweetness left.
- Bottle it. Pour into clean glass bottles with plastic caps or corks (acid eats metal lids). Keep a splash with a bit of the mother to start your next batch faster.
Winter slows everything. A batch that takes 3 weeks in June may take 6 or more in January. Gur works in place of sugar, but it gives a darker, earthier vinegar and can be slower to get going.
What’s happening in the jar, week by week
Two sets of tiny workers take turns. First, wild yeasts from the apple skins eat the sugar and turn it into alcohol and gas. Then acetic acid bacteria take the alcohol and turn it into acetic acid, which is what makes vinegar sour. These bacteria need air, which is why the jar is covered with cloth and never sealed.
| When | What you’ll see | What to do |
|---|---|---|
| Days 2 to 5 | Small bubbles, sweet fruity smell | Stir daily, keep scraps under |
| Week 1 to 2 | Strong cider smell, scraps sinking | Strain out the scraps |
| Week 2 to 4 | Smell turns sharp, a jelly layer forms | Leave it alone |
| Week 3 to 6 | Clearly sour, no sweetness | Taste, then bottle |
Did you know? The word vinegar comes from the French vin aigre, meaning sour wine, because the same second ferment happens to wine left open to the air.
Mother, kahm yeast or mould: how to tell
Most of what you’ll see is harmless. One thing isn’t.
The mother
A smooth, rubbery, slightly see-through disc, beige or pale brown, floating on top or sunk below. It can look like a jellyfish or a thin pancake, and it feels slimy. It’s a mat of cellulose made by the vinegar bacteria themselves, and it’s a good sign that you can reuse, a piece at a time, to get the next jar going faster.
Kahm yeast
A flat, white or cream film that may wrinkle or look slightly powdery, lying flat on the surface. It’s a harmless wild yeast that shows up when the jar is warm or the start was slow. Skim it off with a clean spoon. If it keeps coming back and the vinegar tastes off, start again.
Mould
Raised, fuzzy or furry spots, often round, in blue, green, black, pink or fluffy white. Mould grows roots through the liquid that you can’t see, so skimming won’t save it. Throw away the whole batch, scraps and all, and wash the jar in very hot soapy water. A rotten, sewage or rotten-egg smell means the same: bin it.
Smooth and slimy is the mother. Flat and white is yeast. Fuzzy is the bin, every time.
How to use homemade vinegar, and how not to
Good kitchen uses
- Salad dressing: 1 tbsp vinegar, 2 tbsp oil, a pinch of salt and black pepper, shaken in a jar.
- Sirke wale pyaz: small peeled onions covered with half vinegar and half water plus salt, kept in the fridge and eaten within a week.
- Chutney and raita: a teaspoon in place of lemon.
- Marinade: a spoonful in the masala for chicken or kebabs.
- Cleaning: half vinegar, half water for taps, glass and steel sinks. Never with bleach, and never on marble.
If you drink it
Always dilute it in a full glass of water, never as a shot. The amounts are in our sirka and apple cider vinegar guide. Drink it with or after food, use a straw, rinse your mouth with plain water afterwards and wait 30 minutes before brushing, because acid softens tooth enamel for a while. Skip it completely if you have acid reflux, gastritis or an ulcer; our acidity and heartburn guide explains why sour drinks make it worse.
And the weight-loss claim? Vinegar won’t melt belly fat or replace eating less. The honest verdict, with what the modest effect on fullness really means, is in the sirka guide linked above.
Never use homemade vinegar for canning, bottled preserves or long-keeping achar, because its strength is unknown. Never drink it undiluted, and never give it to children as a drink. Don’t put vinegar undiluted on skin, warts or moles; it can burn. People with acid reflux, stomach ulcers, gastritis or weak tooth enamel should avoid drinking it. If you take insulin or other diabetes medicine, water pills or heart medicine such as digoxin, speak to your doctor before drinking vinegar daily, since large amounts can lower potassium and change how you respond. Throw away any batch with fuzzy mould or a rotten smell.
Homemade apple cider vinegar: questions people ask
How do I make apple cider vinegar at home?
Cover the peels and cores of 6 to 8 apples with 1 litre of cooled boiled water mixed with 4 tbsp sugar, keep them under the liquid, cover with cloth and stir daily for 1 to 2 weeks. Strain, then leave the liquid covered for another 2 to 4 weeks until it’s sour with no sweetness.
Is apple scrap vinegar the same as apple cider vinegar?
Close, but not identical. True cider vinegar starts from pressed apple juice, while scrap vinegar uses peels, cores and added sugar. Scrap vinegar is usually lighter in taste and varies more in strength.
How long does homemade apple cider vinegar take?
Usually 3 to 6 weeks in total. Warm weather is faster; in winter it can take 6 weeks or more.
How do I know when my vinegar is ready?
It smells sharp like vinegar, not like cider or alcohol, and a few drops diluted in water taste clearly sour with no sweetness. If it’s still sweet, give it another week.
Is the white layer on my vinegar mould?
Usually not. A flat white film is kahm yeast and a slimy, rubbery disc is the mother, and both are harmless. Raised, fuzzy spots of any colour are mould, and that batch goes in the bin.
What is the mother in apple cider vinegar?
It’s a jelly-like mat of cellulose made by the bacteria that turn alcohol into vinegar. It’s a sign your vinegar is working, and a piece can start the next batch.
Can I use homemade vinegar for achar?
Only for quick pickles kept in the fridge and eaten within 1 to 2 weeks. For achar meant to last months, use shop vinegar with a stated acidity, because weak vinegar may not stop spoilage.
Can I drink homemade apple cider vinegar?
Yes, if it’s clean and always diluted in a full glass of water, with a straw and a mouth rinse after. Avoid it with reflux, ulcers or gastritis, and ask your doctor first if you take diabetes, water or heart medicine.
Does homemade apple cider vinegar help weight loss?
Not in any way you’d notice on the scale. At most it may help you feel full a little sooner. Portions and daily activity do the real work.
Can I use gur instead of sugar?
Yes. The same amount works, but the vinegar comes out darker and more earthy, and it may take a little longer to start.
Why do I need to remove apple seeds?
Apple seeds hold a natural compound that the body can turn into cyanide when seeds are crushed and eaten in quantity. A few in a jar are not a known problem, but they add nothing, so it’s simplest to knock them out.
How long does homemade vinegar last?
Many months in a capped glass bottle in a dark cupboard. A new mother may form, which is harmless. Throw it away if it grows fuzz or smells rotten.
For more ways to turn scraps into something useful, browse our Zero-Waste Kitchen section.