15-Minute Light and Creamy Dijon Mustard Sauce
A silky Dijon sauce that balances tangy mustard with rich, buttery creaminess while keeping fat minimal through fat-free half and half. This versatile condiment transforms simple proteins into restaurant-quality dinners. The sauce achieves its signature texture from a gentle roux-like thickening technique—flour bloomed into cold dairy, then warmed slowly to avoid lumps or breaking. Key flavors include sharp Dijon mustard, subtle salt, and bright green onion finishes. Perfect for weeknight chicken or fish dinners, it suits home cooks seeking elegant but accessible sauces. What sets this version apart is the restraint: no cream, no egg yolks, just intelligent ingredient ratios and proper technique. Ready in under ten minutes, it's ideal when you need something impressive without fuss.
Ingredients
- ¾ cup fat-free half and halfwhole milk1:1dairy
lighter alternative if whole dairy unavailable
- 2 tablespoon Dijon mustard
- 1 tablespoon all-purpose flour
- ¼ teaspoon salt
- 2 tablespoon green onions, sliced
- 3 tablespoon butter
Instructions
- 1
Combine half and half, Dijon mustard, flour, and salt in a saucepan.
- 2
Cook over medium heat, stirring constantly, until the mixture begins to thicken. Do not boil.
- 3
Stir in green onions and remove from heat.
- 4
Add butter, whisking constantly until the sauce is smooth.
- 5
Serve immediately over chicken or fish.
Tips
Whisk constantly while the sauce heats to prevent lumps from forming in the flour-dairy base. Patience during this stage ensures silky results.
Remove from heat before adding butter so residual warmth melts it smoothly. Whisking vigorously incorporates the fat evenly without breaking the emulsion.
Serve immediately after finishing. This sauce breaks if held too long; if needed for plating, keep warm briefly over low indirect heat.
Good to Know
Refrigerate in airtight container up to 3 days. Reheat gently over low heat with a splash of milk to restore consistency.
Prepare through step 2 up to 4 hours ahead; refrigerate covered. Finish with butter and green onions just before serving.
Spoon warm over grilled or baked chicken breasts, white fish fillets, steamed vegetables, or egg dishes.
Common Mistakes
Do not skip constant stirring during the heating phase to avoid lumps or scorching at the pan bottom.
Do not allow the mixture to boil; high heat breaks the emulsion and can cause separation.
Do not add cold butter straight into very hot sauce; it may seize or separate instead of melting smoothly.
Substitutions
Dairy-Free Swaps
General Alternatives
FAQ
Can I make this sauce ahead of time?
Yes, prepare through step 2 up to 4 hours in advance and refrigerate covered. Finish with butter and green onions just before serving. The sauce may thicken as it cools; add a splash of milk while reheating to restore pourable consistency.
What if I don't have fat-free half and half?
Substitute whole milk at a 1:1 ratio. Heavy cream works too but increases richness significantly. Avoid evaporated milk, which adds unwanted sweetness. The flour thickener compensates for any dairy variation.
How long will this sauce keep in the refrigerator?
Store in an airtight container up to 3 days. Reheat gently over low heat, whisking in a splash of milk if it has thickened. Freezing is not recommended because the emulsion may break upon thawing.