Preheat oven to 450˚F. Grease 4 ramekins and dust with 1 Tablespoon cocoa.
In a medium bowl, melt ⅓ cup butterand 4 ounces dark chocolate at two 30 second intervals, stirring in between until just melted. Microwave 20 seconds more only if needed.
Add 1 Tablespoon boiling water to 1 Tablespoon instant espresso powder Stir into chocolate mixture. Set aside and cool.
In a small bowl, whisk 2 large eggsand ⅓ cup sugar together very well.
Whisk chocolate mixture, and slowly add to the egg mixture in a steady stream.
Fold in ¼ cup flour to chocolate egg mixture only until just combined.
Distribute evenly into prepared ramekins. Set ramekins on a bake sheet.
Bake for 9 minutes, remove. Cool just slightly, then use a flat blade knife to cut around the sides of each ramekin. Invert a serving plate on top of ramekin, then flip it over. Carefully remove ramekin.
Garnish as desired and serve immediately.