Roast Beef Sandwiches

Preheat two skillets over medium high heat. Meanwhile, let the roast come to room temperature.

Mix together the salt, pepper, garlic, olive oil and rosemary in a small bowl and then rub all over the roast. Add to one of the skillets along with the head of garlic, rosemary sprigs and butter. Cook while basting with butter until the the thickest part of the roast reaches around 135º F inside for a medium-rare cook. Remove and let rest for 12 minutes before slicing.

Meanwhile, in the other pan sauté the onions until soft and translucent.

To assemble sandwiches, spread whole grain mustard on rye bread and pile high with onions and roast beef slices. Serve with pickles on the side.