Source: Canadian Living, December 1991

1 cup butterscotch chips
1 can sweetened condensed milk, divided
2 teaspoons white vinegar
4 cups pecan halves
1 package milk chocolate chips
1 teaspoon vanilla extract

In heavy saucepan, over low heat, melt butterscotch chips with 1/3 cup sweetened condensed milk. Remove from heat. Stir in vinegar. Drop by small spoonsful onto wax paper-lined baking sheets. Arrange 3 pecans on each butterscotch drop.

In large heavy saucepan, over low heat, melt chocolate chips with remaining sweetened condensed milk and vanilla extract. Remove from heat. Hold chocolate mixture over hot water. Drop chocolate by heaping spoonfuls over pecan clusters. Chill 2 hours, or until firm. Store loosely covered in refrigerator.

Makes about 5 dozen candies.