Preheat oven to 350°F. Grease a 8" round cake pan. Line the bottom with parchment paper, then grease the parchment as well.
In a large mixing bowl, sift flour, sugar, cocoa powder, baking soda and salt. Mix well to incorporate all the ingredients.
Warm water and milk until they are quite hot to touch.
In a large measuring cup or a medium mixing bowl, combine the hot water+soymilk, oil, vinegar, orange zest & orange extract until well combined.
Add the wet ingredients to dry ingredients and whisk until just combined. DO NOT overmix. A few lumps here and there is perfectly OK.
Pour the batter into the prepared pan and bake in the oven for 28~35 minutes or until a toothpick inserted into the center of the cake comes out clean.
Remove from the oven and let cool for 5~10 minutes. Then carefully flip the pan over a wire rack, peel off the parchment and let the cake cool completely on the wire rack. Frost and Enjoy!!