Sirloin Steak with Pepper Sauce
Peel the lemon, grate the peel and mix with the green pepper. Salt the meat and trim the fat. Heat the butter in a pan. Brown the meat over high heat, then reduce the heat and cook the steak for about 3 minutes on each side, continually basting with the butter.
Remove the meat from the pan and let it rest on warmed plates. Stir the creme fraiche into the pepper-lemon mixture. Season with mustard and salt, to taste. Pour the sauce over the meat.