Sometimes we overcook our cakes. It happens. But all is not lost. Trim off any burned edges. Brush the top of the cake with a layer simple syrup. This will add moisture back into the cake. Take it a step further and infuse your simple syrup with herbs or spices. Brush over cake, perfect or overcooked, to add an additional layer of flavor.
Is the interior of your Dutch Oven stained brown? Do you have burn spots on your stainless steel pots? Use Bar Keepers Friend, water, and elbow grease to remove. In general, try cooking with fats (oil and butter) at lower heats. If you're needing to char something, opt for a cast iron.