Steamed Moist Chocolate Cakes

Ingredients

• 3 cups flour
• 2 teaspoons baking soda
• 1/2 teaspoon salt
• 6 tablespoons cocoa powder
• 2 cups water
• 2 cups sugar
• 1 tablespoon vanilla
• 2 tablespoons white vinegar
• 8 tablespoons (1/2 cup) oil
• a handful of semisweet chocolate chips