Black Garlic: What It Is, Why It’s Not Fermented & Chef’s Spiced Rum Sauce

Sweet, sticky, and packed with umami, black garlic has taken kitchens by storm — but it’s often misunderstood. Learn what black garlic really is, why it’s not fermented, and how to use it in sauces, butter, aioli, and more.

What Black Garlic Actually Is

Black garlic is regular garlic transformed through slow cooking over several weeks at low heat and high humidity. The result is soft, glossy, jet-black cloves with a complex flavour profile: sweet, mellow, and rich in umami — think balsamic, molasses, roasted garlic, and liquorice.

*Tip: Black garlic’s unique flavour comes from the Maillard reaction, not fermentation.

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Why It’s Called “Fermented”

When black garlic became popular, marketing jumped on the “fermented superfood” trend. The wellness industry linked it to gut health, kombucha, kimchi, and other fermented products.

The truth? Any fermentation is minimal. The real magic is heat over time driving the Maillard reaction. Black garlic is flavour alchemy, not fermentation.

The Maillard Reaction

The Maillard reaction happens when amino acids react with sugars under heat, creating:

Deep brown colour

Sweet, complex flavour

Umami and aroma

In black garlic, this reaction stretches over weeks, softening the cloves and producing that signature jammy sweetness without the sharp bite of raw garlic.

“Maillard is the same magic that gives steak its crust and onions their sweetness.”

How Chefs Use Black Garlic

Purées & Sauces: Blitz with stock or cream for instant umami.

Black Garlic Butter: Perfect for steak, chicken, scallops, or roasted vegetables.

Aioli: Adds drama and depth.

Marinades: Pairs with soy, miso, honey, vinegar, or sesame.

Bread: Fold into focaccia or sourdough for deep, sweet pockets.

Pasta: Blend into cream sauces or swirl through cacio e pepe.

Desserts: Pairs surprisingly well with dark chocolate or caramel.

*Chef’s Tip: Treat black garlic like soft dried fruit — a little goes a long way. Blend with stock or warm water for a smooth paste.

Recipe: Spiced Rum & Black Garlic Sauce

Rich, silky, umami-packed, and perfect with beef, pork, venison, or roasted mushrooms.

Ingredients

10 black garlic cloves

½ shallot, finely chopped

30 g butter

300 ml vegetable stock

100 ml double cream

Spiced rum (30 ml, for flambé)

Splash of milk or Vegetable Stock (optional, for adjusting consistency)

Salt

Method

1. Melt butter in a saucepan over medium heat.

2. Add shallot with a pinch of salt, cooking until soft and glossy.

3. Let butter brown slightly for a nutty aroma.

4. Add black garlic cloves and toss for ~20 seconds until softened.

5. Pour in spiced rum and flambé to burn off alcohol, letting flavours meld.

6. Add vegetable stock and double cream; reduce gently.

7. Blend until smooth.

8. Adjust thickness with milk if needed; taste and season.

Silky, umami-rich — elevates almost any dish.