Preheat your oven to 350°F. Prepare a 10-cup springform pan by lining it with parchment paper and greasing it with margarine.
Place the chocolate chunks in a food processor and pulse until finely chopped.
Add the sugar and pulse again until the mixture resembles coarse sand.
With the processor running, slowly pour in the hot coffee, allowing the chocolate to melt.
You may need to scrape down the sides and pulse again to ensure a smooth batter.
Add the margarine in small spoonfuls, followed by the cocoa powder, and pulse until combined.
Incorporate the eggs and vanilla, processing until the batter becomes smooth, creamy, and liquid.
Pour the batter into the prepared pan.
Wrap a long piece of aluminum foil around the pan, allowing it to extend above the rim.
Bake in the center of the oven for about 1 hour and 25 minutes at 350°F.
Start checking the cake after 1 hour, and continue checking every 10 minutes.
The cake is done when the center looks dry and a toothpick inserted in the middle comes out mostly clean, with just a crumb or two.
If the edges brown too quickly before the center is done, fold the foil over the edges.
Allow the cake to cool completely, then cover it with plastic wrap and refrigerate for at least 3 hours or overnight.
Before serving, dust the cake with powdered sugar and garnish with sliced strawberries.