Place oven rack one-third up from bottom and preheat to 325 °F. Gather a 9 inch Bundt pan or tube pan with a 10-cup capacity. Butter pan and dust with fine, plain dry bread crumbs. Invert pan and tap to shake out excess crumbs.
In top of double boiler, over hot but not boiling water, melt chocolate while covered. Remove as soon as it is melted and allow to cool slightly.
In small bowl, sift together flour, baking soda, and salt.
In 2-cup glass measuring cup add 1/4 cup boiling water. Add instant coffee and stir to dissolve. Add cold water until there is 1 1/2 cups total. Add cognac or other alcohol being used.
In large bowl of stand mixer, cream butter. Add vanilla and sugar; beat to mix well. Add eggs one at a time, beating after each addition. Add the melted chocolate; beat until smooth.
On low speed, alternately add sifted dry ingredients in three additions with liquid in two additions, scraping bowl with rubber spatula after each addition. Beat until smooth after each addition.
Pour into prepared pan. Level top.
Bake for 1 hour and 10 - 15 minutes. When tester is inserted into middle of cake it should come out clean and dry. Cool in pan for 15 minutes. Invert onto rack to cool. If using plain tube pan, invert twice, so flat bottom side faces up. If desired, while still very warm, brush with additional alcohol.
Before serving, if desired, sprinkle top with confectioners sugar using fine mesh strainer. If desired, serve with ice cream or whipped cream.