This fermented red chilli hot sauce has been six weeks in the making. It started as a simple ferment — the last red chillies from my La Caja Saludable produce box, a couple of garlic cloves, and 2.5% brine — and sat quietly on the shelf at Casa Adora doing what ferments do. What came out of the jar when I finally blended it was something I hadn't quite expected: fruity, bright, sharp with lime, and with a depth that only fermentation gives you.

I called it Ember Solar. The name felt right.

What Goes Into a Fermented Red Chilli Hot Sauce

The ferment itself is straightforward — 80% red chillies, 20% orange and yellow chillies, two garlic cloves, backslopped with liquid from a previous ferment to get things moving quickly. Two and a half percent brine. Left alone for six weeks.

The blending stage is where the personality comes in. A medium carrot for body and a little sweetness. A small apple for fruitiness. Sliced roasted red peppers — about 200ml — for depth and colour. Two fresh garlic cloves. A thumb-sized piece of fresh peeled ginger for lift. The zest and juice of half a lime instead of orange, which pushed the flavour profile into something sharper and brighter. A tablespoon of honey to balance. A tablespoon of the ferment brine — keeping the connection to the ferment rather than reaching for salt. A tablespoon of ACV. Two tablespoons of extra virgin olive oil to bring it together.

The finished yield was 600ml. The colour is beautiful.

How to Make Ember Solar Fermented Red Chilli Hot Sauce

The ferment (allow 4–6 weeks)

Pack your chillies and garlic into a 750ml jar. Dissolve salt in water at a 2.5% brine ratio and pour over to submerge. Add a tablespoon of liquid from a previous ferment if you have one — this is backslopping, and it gives your ferment a head start. Seal loosely and leave at room temperature, checking every few days. Fermentation is complete when bubbling has stopped and the flavour has developed — tangy, complex, and pleasantly sour.

The blend

Drain the fermented chillies, reserving a tablespoon of the brine. Add the fermented chillies and garlic to a blender with the carrot, apple, roasted red peppers, fresh garlic, ginger, lime zest and juice, honey, reserved brine, ACV, and olive oil. Blend until smooth. Taste and adjust – a little more lime if you want more sharpness, a little more honey if you want it rounder.

Pass through a sieve if you prefer a smoother sauce, or leave it with a little body. Ember Solar works well either way – spoonable and with texture or poured freely from a bottle.

Storage

Pour into a clean jar or bottle and refrigerate. No need to heat this one — the acidity from the ferment, the ACV, and the lime is doing the preserving work. Use within a few weeks, though it is unlikely to last that long.

A note on heating: if you want to stop fermentation completely and extend shelf life further, heat the finished sauce gently to 70°C before bottling. For a fresh batch you plan to use within a few weeks, this is unnecessary. Keep refrigerated either way.

The Yield, The Colour, The Verdict

Six weeks of patience. 600ml of something genuinely good. The lime gives it a citrus sharpness that orange wouldn't have – a happy accident. The ginger pushes through cleanly. The fermented base gives it a complexity that no amount of fresh chillies and vinegar could replicate.

It goes on everything.

This post is part of my Fermentation Hub — a growing collection of fermented foods, hot sauces, and preserves from the Casa Adora kitchen and beyond.

Wonky photos, proper food, genuine adventures — The Flexible Chef