In a microwave-safe dish, microwave butter, covered, until melted; add brown sugar and lemon juice, stirring to dissolve sugar. Reserve 2/3 cup for drizzling.
Brush pork chops with remaining sauce. Grill, covered, on an oiled rack over medium heat or broil 4 in. from the heat for 4-5 minutes on each side or until a thermometer reads 145°. Let stand 5 minutes before serving.
Stir sauce to combine and gently reheat if necessary; drizzle over pork chops. Serve with lemon if desired.