Preheat the oven to 400°F (204°C). Place a wire rack on a baking sheet lined with aluminum foil for easy cleanup.
In a small bowl, mix together the rosemary, thyme, parsley, garlic, breadcrumbs, salt, and pepper. Drizzle in one tablespoon of olive oil and mix until the herbs are well coated.
Pat the rack of lamb dry with paper towels. Season the lamb all over with salt and pepper.
Heat the remaining tablespoon of olive oil in a large skillet over medium-high heat. Sear the lamb on all sides until golden brown, about 2-3 minutes per side.
Remove the lamb from the skillet and let it cool for a few minutes. Brush the Dijon mustard over the meaty parts of the lamb.
Press the herb mixture onto the mustard-coated side of the lamb, creating an even crust.
Place the herb-crusted rack of lamb on the prepared wire rack. Roast in the preheated oven until the internal temperature reaches 130°F (54°C) for medium-rare, about 20-25 minutes.
While the lamb is roasting, gently warm the lavender honey in a small saucepan over low heat until it becomes runny, about 2-3 minutes. Be careful not to let it boil.
Once the lamb is cooked to your desired doneness, remove it from the oven and let it rest for 5-10 minutes.
Drizzle the warm lavender honey over the lamb just before serving.