How To Make Mushroom Ketchup

To make mushroom ketchup, you simmer mushrooms with salt, spices, and vinegar until you get a deep, savory, umami-rich sauce.

This isn’t the sweet, tomato-based condiment you squirt on fries—it’s a historic British staple that’s more like a dark, complex Worcestershire-style sauce.

If you’ve ever wondered how to make mushroom ketchup at home, you’ll be happy to know it’s incredibly simple and requires very little hands-on time.

The magic happens through a slow fermentation and reduction process that transforms humble mushrooms into liquid gold.

In this post, we’ll walk through the entire process of how to make mushroom ketchup, covering the ingredients you need, the step-by-step method, and some tasty variations.

Let’s dive into this forgotten culinary gem.

Why You Should Make Mushroom Ketchup

Learning how to make mushroom ketchup is one of the most rewarding kitchen projects you can try.

First off, the flavor is absolutely incredible—it’s intensely savory, earthy, and slightly tangy.

Unlike regular ketchup, mushroom ketchup doesn’t rely on sugar for its character.

Instead, it gets its depth from the natural glutamates in mushrooms, which give that satisfying savory kick.

It’s also a fantastic way to use up a big haul of mushrooms from the market or your garden.

And making your own means you control the salt level and the quality of ingredients.

Plus, it’keeps for months in the fridge, so it’s a great pantry staple to have on hand.

1. The Flavor Profile Is Unreal

When you make mushroom ketchup, you’re essentially creating a concentrated mushroom extract.

The slow salting process draws out all the flavorful juices from the mushrooms.

Then, when you cook it down with spices, those juices concentrate into a rich, almost meaty sauce.

It’s perfect for adding a boost of umami to stews, gravies, marinades, or even a splash in your bloody mary.

Once you taste it, you’ll wonder why this ever fell out of fashion.

2. It’s Surprisingly Simple and Cheap

You don’t need any fancy equipment to make mushroom ketchup.

A big bowl, a clean cloth, a pot, and bottles are all you really need.

And the ingredients are pantry staples.

Mushrooms are inexpensive, and you might already have the vinegar, salt, and spices in your cupboard.

This makes it a very budget-friendly condiment to prepare at home.

The Classic Method for Making Mushroom Ketchup

So, how do you actually make mushroom ketchup the traditional way?

The process involves two main stages: extracting the liquid and then cooking it into the final sauce.

Here’s the straightforward breakdown of how to make mushroom ketchup from scratch.

1. Prepare and Salt the Mushrooms

Start by cleaning your mushrooms with a brush or a damp paper towel.

Don’t rinse them under water because they’ll soak up the liquid and dilute the flavor.

Slice the mushrooms thinly so they release their juices more easily.

Place them in a large non-reactive bowl (glass or ceramic is perfect).

Then, sprinkle a good amount of salt over the mushrooms and mix well.

Use about one tablespoon of salt for every pound of mushrooms.

Cover the bowl with a clean cloth and let it sit in a cool, dark place for 24 to 48 hours.

During this time, the salt draws out all the moisture, creating a dark, mushroomy liquid at the bottom of the bowl.

This liquid is the star of your mushroom ketchup.

2. Strain the Mushroom Liquid

After a day or two, you’ll see a pool of dark liquid in the bowl.

Now, pour the entire mixture into a fine-mesh strainer lined with cheesecloth set over a large pot.

Let it drain completely, and then, tie the cheesecloth up and press on the mushrooms to squeeze out every last drop of the flavorful liquid.

You can discard the pressed mushroom solids or compost them.

The liquid you have now is the raw basis for your mushroom ketchup.

3. Simmer with Spices and Vinegar

Now, turn on the heat.

To the pot of mushroom liquid, add your vinegar and aromatics.

A classic combination is a few shallots, a clove or two of garlic, a stick of cinnamon, a couple of cloves, some mace, and a bay leaf.

For every pint of mushroom liquid, you’ll want about half a cup of malt vinegar or cider vinegar.

Bring the mixture to a gentle simmer over medium-low heat.

Let it bubble away uncovered for about 45 minutes to an hour.

You want it to reduce by about a third and for the flavors to meld together.

This simmering step is key to learning how to make mushroom ketchup with a rich, cohesive flavor.

4. Bottle Your Homemade Mushroom Ketchup

Once the mixture has reduced, strain it again through a fine sieve to remove all the spices and aromatics.

You’re looking for a smooth, dark, glossy liquid.

Taste it and add more salt if needed, though the initial salting usually covers that.

Pour the hot mushroom ketchup into sterilized glass bottles or jars.

Seal them tightly and let them cool to room temperature before transferring to the fridge.

Properly stored, your mushroom ketchup will keep for several months in the refrigerator.

Flavor Variations and Modern Twists

While the classic recipe is fantastic, you can easily play around with the flavors.

Learning how to make mushroom ketchup can become a template for your own creations.

1. Smoky Mushroom Ketchup

Add a pinch of smoked paprika or a dash of liquid smoke during the simmering stage.

This gives your mushroom ketchup a wonderful barbecue-like depth.

It’s amazing brushed on roasted vegetables or mixed into a burger patty.

2. Spicy Mushroom Ketchup

If you like a little heat, throw in a dried chili pepper or a pinch of cayenne pepper.

You can also add a few slices of fresh ginger for a warm, spicy kick.

This version is fantastic as a dipping sauce or stirred into soups for extra warmth.

3. Herby Mushroom Ketchup

Fresh herbs like thyme, rosemary, or tarragon can elevate your mushroom ketchup to the next level.

Add them in the last 15 minutes of simmering so they don’t become bitter.

The herbs add a fresh, aromatic note that pairs beautifully with the earthy mushrooms.

So, How Do You Make Mushroom Ketchup?

Making mushroom ketchup is a simple process of salting mushrooms to extract their liquid, then simmering that liquid with vinegar and spices.

You don’t have to be a gourmet chef to nail this recipe.

If you love savory, complex flavors and want to try your hand at this historic condiment, this is the perfect project for you.

So gather your mushrooms, get a clean bowl ready, and enjoy the old-fashioned process of making your very own mushroom ketchup.