Butter sides of heavy 2-quart saucepan. In it mix 1 cup packed brown sugar,
1 cup granulated sugar, and 1 cup light cream. Cook and stir over medium
heat till sugars dissolve and mixture boils. Cook to soft ball stage (238);
stir only if necessary. Remove from heat; cool to lukewarm (110). Do not
stir. Add 1 tablespoon butter and 1 teaspoon vanilla. Beat vigorously till
it becomes thick and starts to lose its gloss, 3 to 4 minutes. Quickly
spread in buttered 9x5x3-inch loaf pan. Score while warm; cut when firm.
