Garlic Mayonnaise made with Bread and Fish Stock (Rouille)

Introduction

Rouille is a saffron-tinged garlic mayonnaise thickened with bread and fish stock instead of relying on oil alone, making it more stable and forgiving than traditional mayo. It takes about 15 minutes to prepare and works as a garnish for seafood soups, a spread for toasted bread, or a dipping sauce for grilled fish. The bread acts as an emulsifier, so you can add oil more confidently without the sauce breaking.

Recipe Details

• Prep Time: 15 minutes
• Cook Time: 0 minutes
• Total Time: 15 minutes
• Servings: 4 (makes about 1 cup)

Ingredients

• Baguette bread
• 1 egg yolk
• 100 ml olive oil
• 4 garlic cloves
• Saffron or annatto (for color)
• 6 Tbsp fish stock
• Salt
• Pepper

Instructions

1. Blend the bread, fish stock, and egg yolk together into a paste.
2. Crush the garlic and saffron or annatto, and add to the paste.
3. Gradually add the oil with one hand while vigorously whisking with the other, as when preparing any other mayonnaise.
4. Add salt and pepper to taste.

Variations

Swap annatto for saffron: If saffron is too expensive, annatto delivers the same golden color and works identically in the recipe.

Use roasted garlic instead of raw: Roast 4 garlic cloves at 400°F for 15 minutes until soft, then crush and add. This mellows the sharpness and works well if you prefer a sweeter, less aggressive sauce.

Add a pinch of cayenne or paprika: Stir in 1/4 teaspoon after whisking in the oil to add warmth and depth without changing the texture.

Double the batch and freeze portions: Make a full cup and freeze in ice-cube trays, then thaw in the fridge when needed. Each cube thaws in 2–3 hours and keeps for up to 2 weeks.

Replace fish stock with vegetable or chicken stock: Use the same 6 tablespoons if you want a milder, less briny sauce. The bread and egg yolk will still emulsify properly.

Tips for Success

Use day-old baguette: Fresh bread is too soft and won’t break down into a proper paste. A slice from yesterday blends more efficiently and gives you better texture control.

Whisk vigorously and add oil slowly: Even though bread stabilizes this sauce, treat the oil addition like traditional mayo—go slow and keep whisking to avoid a grainy, broken texture.

Crush the garlic and saffron together first: Use a mortar and pestle or the side of a knife to bruise them before adding to the paste. This releases flavor and ensures even distribution throughout the sauce.

Taste and adjust seasoning at the end: Fish stock carries salt, so season cautiously. You can always add more salt or pepper, but you cannot take it out.

Serve at room temperature or slightly chilled: Rouille thickens as it cools. If you make it ahead, let it sit at room temperature for 10 minutes before serving so it stays spreadable.

Storage and Reheating

Store rouille in an airtight container in the refrigerator for up to 3 days. It does not freeze well—the egg yolk and emulsion break down after thawing, leaving you with a separated, unusable sauce.

Rouille is served cold or at room temperature and does not require reheating. If it has been refrigerated, let it sit on the counter for 10 minutes to soften before serving.

FAQ

Can I use pasteurized egg yolk instead of a raw one? Yes. Pasteurized egg yolks are safer and work identically in this recipe. Use the same quantity.

What if my sauce breaks or looks grainy while I’m whisking in the oil? Stop adding oil immediately. Whisk the broken mixture into a fresh egg yolk and fish stock paste, then slowly add the broken sauce back in, whisking constantly. You can often rescue it this way.

Can I use a food processor instead of whisking by hand? Yes, but pulse it in short bursts rather than running it continuously. Continuous blending generates heat, which can cause the emulsion to break. Hand whisking gives you better control.

Does this work with store-bought mayonnaise as a shortcut? No. The bread and fish stock are structural elements, not optional additions. Starting with mayo removes the entire foundation of this sauce.