Lamb Persillade

Persillade is the French term for a parsley-garlic mixture, and when pressed onto a roasted rack of lamb, it forms a golden, herbaceous crust that shatters with every cut of the knife.

The technique is a two-stage roast. The racks go into the oven bare first and cook for about 10 minutes until very rare. Then the crumb mixture gets pressed firmly onto the warm surface, where the heat and rendered fat help it adhere. Back in the oven, the crust browns and crisps while the lamb finishes to your preferred doneness inside.

Dijon mustard in the persillade is what makes the crust stick. It acts as a flavorful glue between the meat and the bread crumbs, and its sharp, tangy bite cuts through the richness of the lamb. Melted butter binds the crumbs into a crumbly paste that holds together on the surface without falling off.

Press the mixture firmly onto the lamb. A light, loose coating won’t form a crust. You want it packed on so it bakes into a solid, crunchy shell.

Chef Tips

• Bring the lamb to room temperature before roasting for even cooking throughout.
• Use a meat thermometer. For medium-rare after the crust bake, pull at 130°F (54°C) internal.
• Rest the lamb 5 minutes before cutting between the bones. The juices need time to settle.
• Fresh parsley only. Dried parsley turns dusty and tasteless in a persillade.

Variations

• Add fresh rosemary or thyme to the crumb mixture for a more complex herb crust.
• Use panko instead of regular bread crumbs for an even crunchier texture.
• Swap Dijon for whole grain mustard for visible mustard seeds in the crust.