Guide to First Fermentation
The master recipe: how to turn a gallon of sweet tea into kombucha — and the why behind every step, so you can adapt it to your own kitchen.
Ultimate *Updated* Guide to Homemade Kombucha — Ange's current process, start to finish. Watch on YouTube
| Ingredient | Amount |
|---|---|
| Water (fresh, filtered) | Enough to fill a 1-gallon jar, minus headroom (~13–14 cups total) |
| Black tea (or any true tea) | 2–3 tbsp loose leaf, or 6–9 tea bags |
| Plain white cane sugar | ¾–1 cup |
| Strong starter tea | 2 cups (don't skimp — and never substitute vinegar) |
| SCOBY / pellicle | 1 |
Short on starter tea? Halve or quarter the recipe, or top up with plain, raw store-bought kombucha. Getting a SCOBY + starter →
1. Make a tea concentrate
Steep your tea and sugar in 3–4 cups of just-boiled water for 10–15 minutes — a French press makes this easy, but a pot and strainer work just as well (tea leaves like room to bloom, so skip the tiny tea balls). Ange's house blend is 2 tablespoons of English Breakfast plus 1 tablespoon of Assam: rich, honeyed, and endlessly reliable.
Why a concentrate instead of brewing the full gallon hot? Because your culture can't survive above roughly 90–95°F. A small batch of strong tea cools quickly once diluted, so you're not waiting hours for a full gallon to cool down.
Stir the sugar into the hot concentrate — it dissolves effortlessly. If a little stays behind with the strained leaves, no big deal. These measurements are ballpark by design; kombucha is forgiving.
2. Dilute & temperature-check
Put a little room-temperature water in the bottom of your gallon jar first (pouring hot liquid straight onto glass can crack it), strain in the concentrate, then top up with water — leaving a bit of headroom for the starter tea and SCOBY.
Check the temperature: you want it below 90°F and above 65°F before anything living goes in. Too warm? Add a splash more cool water and stir.
3. Add starter tea + SCOBY
Pour in two full cups of strong starter tea, add your SCOBY, and give it a gentle stir to distribute. Most recipes call for one cup of starter; Ange recommends two — it's the single cheapest insurance policy against mold, because the faster the acidity drops, the less time anything nasty has to move in. Don't have strong starter yet? Here's how to find and source good starter tea →
Your pellicle might float, sink, or hover sideways. None of it means anything. A new pellicle will usually start forming at the surface either way.
4. Cover & tuck it away
Cover the jar with a clean, tightly-woven cloth and secure it with a rubber band — the brew needs airflow, but fruit flies need to stay out. Keep it away from direct sunlight, somewhere with decent air circulation. A shelf works beautifully; a closed, musty cupboard doesn't. Choosing a vessel and location →
5. Wait (and taste)
Now the culture takes over. Expect a new SCOBY to start forming across the surface within a few days — white specks first, then a translucent film, then a proper layer. Cooler homes grow thinner SCOBYs, or sometimes none at all; that alone doesn't mean fermentation has stalled. Full guide to what you'll see →
Start tasting around day 5 (day 3–4 in hot weather). Slip a straw past the SCOBY and sip. You're tasting for the moment the sweetness and tartness cross over into something you'd happily drink. At an average room temperature around 70°F, most batches land between 7 and 14 days. It's done when it tastes done to you. How to judge doneness →
6. Harvest & set up your next batch
With clean hands, lift out the pellicle(s) and set them on a clean plate. Stir the brew to rouse the yeast that's settled at the bottom, then reserve two cups — that's the starter tea for your next batch (or a deposit into your SCOBY hotel). Everything else is ready to drink as-is, or to flavor and carbonate in second fermentation.
The why behind the recipe
- Why black tea? It ferments consistently, feeds the culture well, and its malty-honey notes flatter kombucha's tang. Any true tea (green, white, oolong, pu-erh) works — just never herbal infusions or teas with added oils and flavorings. Tea 101 →
- Why plain cane sugar? It's the easiest food for the yeast to digest. Honey, brown sugar and sweeteners disrupt the culture's balance. Sugar 101 →
- Why both starter tea and a pellicle? The living culture is mostly in the liquid — but in Ange's side-by-side tests, batches with both dropped in pH and fermented faster. More momentum, less risk. Quality matters here: how to find and source good starter tea →
- Why so imprecise? Because it genuinely doesn't need to be precise. Stay in the ballpark and pay attention to taste — that's the whole game.
Almost certainly not — new SCOBY growth fools nearly everyone at least once. Fuzzy, dry, blue-green circles on the surface are mold; everything else probably isn't. The mold guide (with a checklist) →