Preheat oven to 350 °F for at least 15 mins
Prep two 8 or 9 inch cake pans: use baking spray, or oil and flour pans. line the bottom of both pans with parchment paper
Pour sugar into the wine and stir until it the sugar is mostly dissolved
Sift flour, cocoa powder, salt, and baking soda into a large bowl
Make a well in the center of the flour mixture. Pour wine & sugar mixture, oil, vanilla extract, & vinegar into the well.
Using a whisk or spatula, gently mix until the dry ingredients are well combined with the wet ingredients. Do not over mix.
The batter will be runny. Pour half of the cake mix into each of the pans.
Knock the pans on the counter a few times to release air bubbles.
Bake in oven for 30-35 minutes, or until a skewer/toothpick/tester comes out clean.
Allow layers to cool in the pan on a rack for 8-10 mins before turning out.