Prep Time 15 minutes mins
Cook Time 18 minutes mins
Resting Time 30 minutes mins
Total Time 1 hour hr 3 minutes mins
Use gel food coloring for a vibrant hue without thinning the batter; liquid dye can make the batter runny. Room-temperature ingredients help the batter emulsify and rise evenly, while overmixing can make the cake dense, so mix only until the flour disappears. If you don’t have buttermilk, make a quick substitute by mixing 1/2 cup milk with 1/2 tablespoon lemon juice or vinegar and letting it sit for 5 minutes. For extra tenderness, avoid Dutch-process cocoa and use natural cocoa to react properly with baking soda. Crumble any cake trimmings to make red velvet crumbs for a decorative garnish on the frosting.