The gentle saute process caramelizes onion, making it sweet. The cake has no onion flavor, yet is rich, dense and extremely moist. Sweet onions are essential to the success of this recipe. Do not substitute standard yellow cooking (storage) onions. If you absolutely cannot bear the thought of a cake with onions, you may omit them and still have a deliciously rich and moist double chocolate cake.
This recipe caught my eye because it looked like an elegant way to serve “individual” lasagna portions.