1Blend cheese, pine nuts, parsley and garlic in processor. With machine running, gradually add oil and lemon juice through feed tube and mix until thick.
2Spread pesto generously over meat.
3Press breadcrumbs into pesto to coat completely. (Can be prepared ahead. Let stand at room temperature up to 6 hours or cover and refrigerate up to 24 hours. Bring to room temperature before continuing.)
4Preheat oven to 400. Set lamb meat side up in roasting pan.
5Roast until thermometer inserted in thickest part of meat registers 130 (rare), 25 -30 minutes. Let stand.