PREPARATION:
- Line 9-inch square pan with heavy-duty foil, leaving 1-inch overhang on all sides.
- Combine butter, sugar, water and salt in heavy 2- or 2-1/2-quart saucepan. Bring to a boil over medium heat, stirring frequently. Attach candy thermometer to side of pan. Continue boiling about 20 minutes or until sugar mixture reaches hard-crack stage (305° to 310°F), stirring frequently. Watch closely after temperature reaches 290°F. Temperature will rise quickly and mixture will burn above 310°F.) Remove from heat; stir in vanilla. Immediately pour into prepared pan, spreading to edges. Cool completely.
- Microwave chocolates in small microwavable bowl on MEDIUM (50%) 5 to 6 minutes or until melted, stirring every 2 minutes.
- Spread chocolate evenly over toffee. Sprinkle chocolate with pecans. Refrigerate about 35 minutes or until chocolate is set.
- Carefully break toffee into pieces without dislodging pecans. Store in airtight container at room temperature between sheets of waxed paper.
