Mustard Powder Uses: Cheese Sauces, Dressings, Rubs and Homemade Mustard

Mustard powder is one of the handiest jars in a savory kitchen because it brings mustard flavor without the liquid, vinegar or salt of a prepared mustard. It’s the quiet partner in a classic mac and cheese, Welsh rarebit and German coleslaw, and it works in rubs, glazes, deviled eggs and homemade mustard. The catch: dry powder has little bite on its own. Its heat forms once it gets wet, and whether you wet it with cool water or vinegar changes what you get. More on the jar itself is on the mustard powder profile.

At a glance

Those amounts come straight from the recipes. McCormick’s own warning applies to all of them: a small amount enhances a dish, but more can dominate and overpower other flavors.⁴

First, how the heat works

Dry mustard powder has little bite on its own. The heat forms when water lets an enzyme in the seed act on a sulfur compound.⁷

What that means for you:

• For full heat, wet it first. In the Colman method behind British mustard, the powder is mixed with water shortly before use, and the flavor develops within about 10 minutes.⁶
• Use cool water, not hot. Water that’s too hot kills the enzyme.⁷
• Water before vinegar. Strong acid like vinegar stops the enzyme, so powder stirred straight into vinegar gives a milder result.⁷
• Cooking changes it. Katzer notes that heat quickly destroys the pungent compounds already formed in black and brown mustard, and suggests adding mustard late to cooked foods if you want some pungency.⁸ None of the sources we checked measures how much of yellow mustard powder’s bite survives a cheese sauce, so in cooked dishes, think of it as flavor more than heat.

Cheese sauces: mac and cheese and rarebit

This is mustard powder’s classic job. America’s Test Kitchen’s classic macaroni and cheese whisks 1 1/2 teaspoons of dry mustard and 1/4 teaspoon of cayenne into the butter with the flour, before the milk and cheese go in.¹ McCormick also suggests it for mac and cheese sauce.⁴ Catherine Lamb’s Welsh rarebit for Food52 whisks 1 teaspoon of English mustard powder and 1/2 teaspoon of cayenne into the roux, then adds stout, Worcestershire and sharp cheddar.²

Powder adds no liquid, so it suits a cheese sauce you want to keep thick. The same base works for potatoes au gratin, cheese soups and a grilled cheese spread, though none of these sources gives amounts for those. See spices for mac and cheese and spices for grilled cheese, and cayenne pepper uses for its usual partner.

Dressings, slaw and mayonnaise

• Vinaigrettes. Mustard contains emulsifiers, so besides adding flavor, it helps oil and vinegar hold together.⁶ McCormick suggests adding the powder to salad dressings.
• Coleslaw. Saveur’s German coleslaw whisks 1 teaspoon of dry mustard and 1/2 teaspoon of celery seeds into 1/3 cup of vinegar, then sugar, then 1/2 cup of oil in a thin stream, for 8 cups of cabbage and carrot.³ The powder goes straight into vinegar, which stops the heat-forming enzyme,⁷ so by our reading you’ll get a mild mustard note, not a sharp one.
• Mayonnaise. Yellow mustard’s uses include mayonnaise and salad dressings, according to Saskatchewan’s agriculture ministry.⁹ A pinch of powder in homemade mayonnaise adds flavor without thinning it.
• Dips. McCormick suggests mixing it with mayonnaise, sour cream or Greek yogurt for a dip.⁴

See celery seed uses for the other half of that slaw dressing.

Rubs, marinades and roasted vegetables

McCormick recommends ground mustard in rubs and marinades for pork, chicken, beef and seafood, as a dry rub for beef, and tossed with olive oil, salt and pepper on vegetables like asparagus, carrots and potatoes before roasting. Here it adds a sharp, slightly bitter savor more than heat. McCormick itself describes the taste as sharp, hot and slightly bitter.⁴

It turns up in Louisiana blends too. USDA’s purchasing specification lists mustard among the minimum ingredients of Creole seasoning, with salt, paprika, garlic, cayenne, black pepper and lemon peel.⁵ See Creole seasoning.

A few more places it fits: meatloaf and burger mixes (see good spices for meatloaf and spices for hamburgers), and a brown sugar or honey glaze for ham, which McCormick includes among its ground mustard recipes.⁴ See spices for ham.

Deviled eggs and potato salad

McCormick lists deviled eggs and red potato salad among its ground mustard recipes.⁴ Mix the powder into the yolk filling with the mayonnaise, where the moisture lets its flavor develop. Dusted dry on top, it looks like paprika but won’t taste of much until it gets wet, going by how the heat forms (above).

Homemade prepared mustard

The simplest mustard is powder and cool water. Most British mustard is made by the Colman method: powder mixed with water shortly before use, ready in about 10 minutes.⁶ For a jarred mustard, Popular Science’s chemistry points to mixing the powder with water first and adding vinegar once the heat has developed, since acid stops the enzyme. Mustard made with cold water needs time to rest, and Popular Science suggests resting homemade mustard in the fridge for two to three days.⁷ Yellow mustard is the seed behind classic American hot dog mustard.⁹ Some brands color their mustard bright yellow with turmeric.⁶ Beer, wine, honey or sugar are popular additions.

For how powder and jarred mustard differ, see mustard powder vs. prepared mustard.

Swapping it

If a recipe calls for dry mustard and all you have is prepared mustard, NDSU Extension gives 1 tablespoon of prepared mustard for each teaspoon of dry mustard.¹⁰ Cut back a little on other liquid to make room for it. More options are on mustard powder substitutes, and to grind your own from seed, see mustard powder vs. mustard seed.

Allergy note

Mustard is one of the 14 allergens UK food businesses have to declare.¹¹ It isn’t one of the nine major food allergens under US law,¹² so a US label may not flag it. Mention it when you’re cooking for guests.

Not yet measured

• How much of yellow mustard powder’s pungency survives cooking in a sauce.
• A tested per-serving amount for rubs, marinades or dressings; the amounts above come from single recipes.
• Whether “English” mustard powders differ in strength from other yellow powders.

Related

• Mustard powder and mustard seed uses
• Mustard powder substitutes
• Mustard powder vs. mustard seed and mustard powder vs. prepared mustard
• Yellow mustard seeds and horseradish