Chicken Breasts with Walnut Aillade

Aillade is the lesser-known cousin of pesto, a rustic French sauce from the Languedoc region built on pounded walnuts, garlic and good oil. Smeared over chicken breast at the end of a quick pan sear, it slumps into a creamy, nutty coat that tastes far more luxurious than the short ingredient list suggests.

The yogurt-lemon marinade does two jobs at once. The lactic acid in the yogurt tenderizes the chicken so it stays juicy under the heat, and the lemon juice brightens everything before the rich aillade goes on. Wiping off the surplus before searing is important. Wet yogurt steams instead of browns and you lose the golden crust.

Walnut oil is the right call for the sauce. It carries the same toasted flavor as the nuts themselves and doubles down on the character of the dish. If you can’t find it, a half-and-half mix of mild olive oil and a small amount of toasted walnut or almond oil works as a stand-in.

Drizzling the oil slowly while the processor runs is the trick. Like a mayonnaise, the emulsion has to come together gradually or it breaks. A thick spoonable sauce, not a vinaigrette, is what you’re after.

Chef Tips

• Toast the walnuts in a dry pan for 3 to 4 minutes before grinding to deepen the flavor.
• Add the garlic in halves, taste, and add more. Two ounces is bold, which is traditional, but you can dial it back.
• Sear the chicken in a hot pan first, then drop the heat low when you add the sauce. The aillade scorches if it sits over high flame.
• Leftover aillade keeps a week in the fridge and is excellent on toast or roasted vegetables.

Variations

• Swap walnuts for hazelnuts or a mix of both for a different nutty profile.
• Stir in a teaspoon of Dijon mustard for a sharper, more vinaigrette-like sauce.
• Use boneless thighs instead of breasts for a richer, more forgiving result.