Pella — 1 1/2 cups all-purpose flour
1 cup sugar
1 teaspoon baking soda
1/2 teaspoon salt
3 tablespoons cocoa, plus more for dusting cake
1 tablespoon vinegar
1 tablespoon vanilla extract
1 cup warm water
6 tablespoons vegetable oil
1. Preheat oven to 350F.
2. Mix dry ingredients together. Make a well in dry ingredients and add wet ingredients. Mix well. If the batter isn't very loose, add just a bit more warm water, 1 tablespoon at a time, until you get a thin batter. This will make a very moist cake.
3. Pour into an 8- or 9-inch square pan. Bake 25 to 30 minutes, until a wooden pick inserted in the center comes out clean. Let cool and dust with cocoa.