Step 1In a medium bowl, toss the strawberries with the wine and refrigerate, covered, overnight.
Step 2Reserving the wine, strain the strawberries. Pour the wine into a small saucepan, bring it to a boil and reduce by about half; it should be thick and syrupy. Cool completely. Reserve the strawberries and their sauce separately until serving. The strawberries will keep for 1 day refrigerated.
Step 1Heat the oven to 350 degrees. Oil a 9-inch cake pan and line the bottom with parchment paper, then oil the parchment. If using a pan with a removable bottom, cover the outside of the pan with aluminum foil to prevent water from entering when the cake cooks in a hot water bath.
Step 2In a medium heavy-bottom saucepan with a lid, bring half a cup of water to a boil. Remove from the heat and stir in the chocolate, margarine and 1 cup of the sugar. Cover and allow the residual heat to melt the ingredients. Check after several minutes, and stir with a rubber spatula to combine the ingredients, ensuring they are fully melted to a smooth texture.
Step 3Place the remaining sugar and eggs in the bowl of a stand mixer or in a large bowl. Whip the eggs until the mixture is doubled in volume. Meanwhile, boil some water for the hot water bath.
Step 4Fold a third of the melted chocolate into the whipped eggs gently with a rubber spatula. Fold in half of the remaining chocolate until combined, then gently fold in the remaining chocolate. Immediately pour the batter into the cake pan. Place the cake pan in a roasting pan that's large enough to hold the smaller pan with at least a 1-inch margin on all sides, then place inside the oven. Add hot water to halfway up the cake pan.
Step 5Bake for 45 to 55 minutes, until the cake no longer jiggles when shaken and the crust formed on top has begun to crack. Remove to a rack to cool. Invert the cake onto a cake stand or plate. Do not remove the parchment paper until ready to serve. At this point, the cake may be refrigerated for up to 1 day before serving. To serve, bring the cake to room temperature. Slice the cake with a warm, wet cake knife. Top each slice with Zinfandel-macerated strawberries and a drizzle of the reduced sauce.