Caramelizing the onions: This isn't a step that can be rushed and it can take up to an hour. If you crank up the heat to try and speed up the process, the onions will burn, so you just need to be patient (don't worry, it'll definitely be worth it!)
A crispy topping: The cheese melts when you add it to the pan at the end but another option is to brown it. To do this, give it a few minutes under the broiler.
Fresh is best: The key to this recipe being a success is using the best ingredients. That means fresh garlic, fresh thyme, fresh parsley, and good quality wine, baguette bread and gnocchi.
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