# Brown Mustard Sauce (Robert Sauce)

> Brown Mustard Sauce (Robert Sauce) (ready in about 25 minutes, makes 3 servings), laid out as Shop It, Mise It and Make It: shop once, prep everything, then cook.

Published: 2026-04-10
Posted by Suzanne Lejeune

- **Yield:** 3 servings
- **Total time:** ~25 minutes
- **Cuisine:** French
- **Course:** Sauces and Dressings
- **Est. cost:** ~$10–$16 CAD (at time of writing)

Robert Sauce (Brown Mustard Sauce) | SIMM

Recipe Warnings

- Depends on pre-made Julia’s Brown Sauce — not recreated here.

## Shop It

### Produce

- 1/4 cup yellow onion (finely chopped)
- 3 Tbsp parsley

### Dairy

- 4 Tbsp butter

### Oils, Vinegars & Spices

- 1 tsp olive oil
- Salt & pepper

### Pantry

- 4 Tbsp Dijon mustard
- 1/8 tsp sugar

### Liquids

- 1 cup white wine
- 2 cups brown sauce

## Mise It

### Sauce base

- Chop onion finely
- Chop parsley

### Liquids

- Measure wine
- Measure brown sauce

### Finish mix

- Soften butter
- Add mustard
- Add sugar

## Make It

1. **COOK** onion in oil and butter until soft.
2. **ADD** wine and reduce.
3. **ADD** brown sauce and simmer.
4. **SEASON** with salt and pepper.
5. **REMOVE** from heat and whisk in butter, mustard, sugar, and parsley.
6. **SERVE!**

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