Halve and core pears. Arrange in baking dish with narrow ends toward center. In each half place 1/2 tablespoon brown sugar and 1/2 tablespoon butter. Cover. Microwave, rotating dish 1/2 turn after half the time. Let stand 2 minutes. (Cook 4 halves 4 to 6 1/2 minutes. Cook 8 halves 7 1/2 to 10 1/2 minutes.)