Preheat your oven to 375 degrees F.
Season the defrosted lamb on both sides liberally with the salt and pepper.
Preheat a cast iron or heavy skillet over medium-high heat.
Add in the butter until melted.
Place the lamb rack, skin side down on the butter.
Cook for 6-7 minutes and then carefully flip to the other side.
Cook another 5-7 minutes until golden.
Move the rack of lamb to sear the back and edges of the rack as well.
Rest the lamb on a rack over a baking sheet.
Make the coating: Add all ingredients in a small skillet.
Toast the breadcrumb coating over medium-low heat for 3-4 minutes until lightly golden and fragrant.
Remove the toasted crumbs onto a shallow plate.
Brush the rested lamb racks with mustard on the skin side/tops only.
Take each rack and press it firmly over the toasted crumb mixture to make sure the coating sticks.
Place the lamb back over the baking rack that’s over a baking sheet. Place the lamb topping side up.
Roast in the oven until the temperature of the lamb is anywhere between 125 degrees F and 135 degrees F for rare to medium-rare. This takes about 15 minutes.
Remove the lamb and allow it to rest for 8 minutes before slicing it.
Slice and serve the lamb lollipops over a bed of mashed potatoes and a side of sautéed green beans.
ENJOY