Preheat the oven to 450 degrees.
In a small bowl, combine mustard, garlic, salt and pepper.
In a separate bowl combine the panko and herbs.
Season the lamb all over with salt and pepper.
Next, rub the meat all over with the mustard mixture.
Press the panko/herb mixture to the lamb, using the mustard to help it adhere.
Insert a meat thermometer into the thickest part of the roast.
Place the roast on a lined cookie sheet/baking tray.
Bake for 20 minutes or until themometer reads 130 degrees.
Let meat rest for 10 minutes before slicing to serve.