It started with a wet Sunday in the late 1980s. I was living at Wolstenholme Fold, a hamlet near Rochdale, the kind of place that earns its reputation for grey skies – and I needed mustard powder. Not Dijon, not wholegrain, not any of the interesting alternatives. Yellow mustard powder. The kind that comes in a bright yellow tin with a bull on the front and makes your eyes water if you get too close.
I needed it for a sauce. The sauce that would eventually become The Wolstenholme Fold Sauce — but that's a story for another post.
Fast forward thirty-odd years to rural Andalucía, and the problem hasn't gone away. Spanish supermarkets stock Dijon by the shelf-load. Wholegrain mustard, no problem. Yellow mustard powder in a tin? I have never seen it. When the memory of that sauce came back to me — as food memories do, without warning and with complete insistence — I did what I always do in Casa Adora when the shelves let me down.
I made my own.
The Wahl coffee grinder — the one that lives on the Casa Adora spice shelf and gets cleaned between uses by running a handful of basmati rice through it — handles mustard seeds beautifully. Two minutes and you have something remarkably close to the real thing. Nearly Colman's, in fact.
The Flexible Chef's verdict: pretty close. Nearly, even. The heat is there, the colour is right, and it does everything Colman's does in a recipe. Make a small batch, keep it airtight, and you won't miss the yellow tin.
Why Make Homemade Mustard Powder?
Homemade mustard powder is simpler to make than you might expect — and considerably fresher than anything that's been sitting in a tin on a supermarket shelf. The heat in mustard powder comes from volatile compounds released when the seeds are ground, which means freshly ground always outperforms pre-ground. Making your own also means you control the ratio of yellow to black seeds — more yellow for a milder powder, more black for something with real bite.
How to Make Homemade Mustard Powder
Makes approximately 3 tbsp
Ingredients
- 2 tbsp yellow mustard seeds
- 1 tbsp black mustard seeds
- ½ tsp turmeric
- ¼ tsp fine salt
- Optional: ¼ tsp cornflour (softens the bitterness, stabilises heat)
- Optional: pinch of sugar (balances the natural sharpness)
Method
- Grind — Place the yellow and black mustard seeds in a spice grinder and grind to a fine powder.
- Sieve & re-grind — Sieve the powder and return any coarse pieces to the grinder. Repeat until the texture is smooth and flour-like.
- Mix — Combine the mustard powder with turmeric, salt, and the optional cornflour and sugar. Stir well.
- Store — Decant into a small airtight jar. Keeps well in a cool dark place.
To Use
Mix 1 tbsp mustard powder with 1 tbsp cold water. Stir and leave for 10 minutes — the heat needs time to fully develop. Use within an hour, as the heat fades as it sits.
Use anywhere Colman's is called for — in sauces, dressings, rubs, and anywhere a recipe needs that clean, sharp mustard heat. It's also the essential ingredient in The Wolstenholme Fold Sauce – the recipe that started all of this.
What Is Mustard Powder?
Mustard powder — also called dry mustard or ground mustard — is simply mustard seeds ground to a fine powder. It has a sharper, more concentrated heat than prepared mustard, because the volatile compounds responsible for that heat are released when the seeds are ground and then again when moisture hits them. Which is why freshly ground always outperforms anything that has been sitting in a tin.
The classic English version — Colman's — is made from a blend of brown and white seeds, double-milled for extra intensity. The yellow colour comes largely from the white (sometimes called yellow) seeds, though turmeric is occasionally added commercially to boost it. Make your own and you control both.
What Is Mustard Powder Used For?
More things than you'd think. It has two modes: invisible background heat, and upfront mustardy sharpness, depending on how you use it.
In sauces and condiments — mustard powder is the starting point for prepared mustard, including Colman's itself. It also goes into Homemade Branston Pickle, Worcestershire sauce, BBQ sauce, and mayonnaise — where it acts partly as flavour and partly as an emulsifier.
In cheese dishes — Welsh rarebit, cheese sauce, mac and cheese. Mustard powder sharpens and lifts the cheese without tasting of mustard in the finished dish. If your cheese sauce ever tastes flat, a pinch of mustard powder is usually the answer.
In dry rubs and marinades — it adds heat without the chilli note, and helps a crust form on grilled or roasted meat. Works particularly well on beef and pork.
In braises and casseroles — added early in a chicken casserole or a slow-cooked braise, it dissolves into the sauce and adds depth without being identifiable.
In salad dressings — whisked into a vinaigrette with oil and vinegar, it adds heat and helps the emulsion hold.
Mustard Powder Substitutes
If you need mustard powder and don't have it — or can't find it, which is exactly how this recipe started — there are a few options.
Dijon mustard is the most useful substitute. Use roughly one teaspoon of Dijon for every half teaspoon of mustard powder called for, and reduce any liquid in the recipe slightly. It won't be identical — Dijon is wetter and milder — but it works in most sauces and dressings.
Wholegrain mustard gives you the flavour but changes the texture. Fine for dressings and marinades; less ideal in a smooth sauce.
Horseradish shares some of the same volatile heat compounds as mustard and can stand in for it in some dishes — particularly with beef.
Or you make your own. Which is the point of this page.
How Long Does Mustard Powder Keep?
Properly stored in an airtight container in a cool, dark place, mustard powder keeps for one to two years. The heat fades gradually as those volatile compounds dissipate — which is why a tin of Colman's that's been open on the shelf since last Christmas is going to disappoint.
Freshly ground mustard powder keeps the same way but tastes noticeably better for the first few months. Make small batches and use them up.
Find more of my homemade condiment recipes in the Nearly Series.
Wonky photos, proper food, genuine adventures – The Flexible Chef
