Then being to prepare the gratin. Lightly grease an oven safe baking dish or pan (I like to use my
lodge cast iron pan for this) with a tbsp of olive oil. Then add your first layer of cauliflower slices. Do your best to create a nice even layer (but it doesn't have to be perfect). Next drizzle on about a 1/4 cup of the garlic/cream mixture. then top the cauliflower layer with a generous amount of shallots, and about 1/4 cup of parmesan.