Line 8- or 9-inch pan with wax paper or parchment. Melt chocolate chips with sweetened condensed milk and salt in a heavy saucepan. Remove from heat; stir in extract of choice. Spread evenly in prepared pan. Chill 2 hours or until firm. Remove from pan by lifting edges of wax paper; peel off paper. Cut into squares.

Tip - use high quality chocolate and you will never need to buy fudge again.

If you want to make this pareve you can try using a non dairy substitute for condensed milk.