Lifehacker has been a go-to source of tech help and life advice since 2005. Our mission is to offer reliable tech help and credible, practical, science-based life advice to help you live better.

Slice into wedges to serve right away, or cool to room temperature before cutting. Makes 8 servings. Icing: Melt 1/4 cup unsalted butter with 2 tablespoons cocoa powder in a saucepan over medium heat.