Creating the Red Velvet Mocha Cake is simple if you follow these step-by-step instructions:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease and flour three 9-inch round cake pans.
2. Mix Dry Ingredients: In a large bowl, sift together the flour, cocoa powder, baking soda, baking powder, and salt. Set aside.
3. Combine Wet Ingredients: In another mixing bowl, combine the vegetable oil, buttermilk, eggs, vanilla extract, red food coloring, and brewed coffee. Whisk until well-blended.
4. Combine Mixtures: Gradually add the wet ingredients to the dry ingredients, stirring until just combined. Avoid overmixing; a few lumps are okay.
5. Divide Batter: Pour the batter evenly into the prepared cake pans.
6. Bake: Place in the preheated oven and bake for 30-35 minutes or until a toothpick inserted in the center comes out clean.
7. Cool the Cakes: Remove from the oven and let them cool in the pans for about 10 minutes. Then, gently turn them out onto wire racks to cool completely.
8. Prepare Mocha Frosting: In a bowl, beat the softened butter until creamy. Gradually add the powdered sugar and cocoa powder, mixing on low speed. Add the brewed coffee, vanilla extract, and salt, mixing until smooth and fluffy.
9. Frost the Cakes: Once the cakes are completely cool, place one layer on a serving platter. Spread a generous amount of mocha frosting on top. Repeat with the second layer, then place the third layer on top.
10. Decorate: Use the remaining frosting to cover the top and sides of the cake. If desired, decorate with chocolate shavings or coffee beans for an extra touch.

Following these steps will help you create a stunning Red Velvet Mocha Cake that is sure to impress!