Preheat oven to 300 degrees.

Grease a 9 1/2 inch deep pie plate. Set aside.

Separately, heat hot water in a kettle. (You will be baking the cake in a hot water bath.)

In saucepan over medium heat combine water, salt and sugar until completely dissolved.

Add in chocolate, stirring constantly until completely melted.

Remove from heat.

Cut butter into small pieces and stir into melted chocolate until completely melted. (You may need to return to heat for a minute.)

Beat in eggs one at a time.

Pour the batter into the prepared cake pan.

Place pie plate in a larger pan. (A roasting pan works nicely.)

Carefully pour hot water 1/2 way up the sides of pie plate.

Bake cake in water bath at 300 degrees for 45 minutes. Center may still look slightly wet after 45 minutes. That's ok, it will firm up.

Cool, then chill cake overnight.

Serve with vanilla ice-cream or whipped cream and chocolate shavings. Or plain.