Bone Marrow Butter

Name: Bone Marrow Butter
Ingredients: 6-8 marrow bones, cut short, no longer than 2 inches tall; 1/2 cup of butter, cut into 1 inch cubes and softened; 1/4 tsp. sea salt ( where to buy sea salt ); 1/4 tsp. dried rosemary ( where to buy organic dried rosemary ); 1/4 tsp. fresh parsley, chopped fine