Burning implies being subjected to fire or intense heat continuously, which is certainly not ideal for any cake or food item.
In a literal sense, if a chocolate cake were to burn, it would be rendered inedible and possibly even unsafe to consume. Proper baking involves monitoring the cake closely to avoid burning or overcooking, as it can lead to a dry, charred, and unpleasant taste.
On a lighter note, the phrase "burn for eternity" is often used metaphorically or humorously to describe something that is enduring or unforgettable. In that sense, one could playfully say that a particularly delicious chocolate cake is so good that its taste will "burn in your memory forever." But again, this is just a figure of speech and not an actual physical state.
In reality, we want chocolate cakes (and all cakes) to be baked to perfection, not burned, so they can be enjoyed and savored by everyone!