Creamy Chocolate Pie

1 prepared graham cracker crust
3 (1-ounce) squares unsweetened or semi-sweet chocolate
1 (14-ounce) can sweetened condensed Milk (NOT evaporated milk)
¼ teaspoon salt
¼ cup hot water
1 teaspoon vanilla extract
1 cup (1/2 pint) whipping cream
Additional whipped cream or whipped topping
Shaved chocolate

In heavy saucepan, over medium heat, melt chocolate with sweetened condensed milk and salt. Cook and stir until very thick and fudgy, 5 to 8 minutes. Add water; cook and stir until thickened and bubbly. Remove from heat; stir in vanilla. Cool 15 minutes. Chill thoroughly, 20 to 30 minutes; stir.
In large mixer bowl, beat 1 cup whipping cream until stiff; fold into cooled chocolate mixture. Pour into crust. Chill 3 hours or until set. Garnish with additional whipped cream and shaved chocolate. Refrigerate leftovers.