1In heavy 3-quart saucepan, heat brown sugar, granulated sugar, milk, corn syrup and salt to boiling, stirring constantly. Reduce heat to medium. Cook uncovered about 15 minutes, without stirring, to 236°F on candy thermometer or until small amount of mixture dropped into cup of very cold water forms a soft ball that flattens when removed from water. Cool about 1 hour, without stirring, until saucepan is cool to the touch.
2Add vanilla and pecan halves. Beat with spoon about 1 minute or until mixture is slightly thickened and just coats pecans but does not lose its gloss. On waxed paper, drop mixture by spoonfuls, dividing pecans equally. Let stand uncovered 1 to 2 hours or until candies are firm and no longer glossy.
3Wrap candies individually in waxed paper or plastic wrap. Store in airtight container.