Grilled Sirloin with Anchovy-Lemon Butter and Broccoli Rabe

INGREDIENTS

Cooking spray

boneless sirloin steak

1/2 tsp

kosher salt, divided

3/8 tsp

ground black pepper

2 tbsp

unsalted butter

1 1/2 tsp

grated lemon rind, divided

1 tsp

fresh lemon juice

1/2 tsp

anchovy paste

1 tsp

extra-virgin olive oil

1/4 cup

presliced onion

garlic cloves, sliced

1/4 tsp

crushed red pepper

1/2 cup

fat-free, lower-sodium chicken broth

8 oz

broccoli rabe (rapini), cut into 1-inch pieces