Cut the cauliflower into florets. Place in a large pot and fill with water. Boil the cauliflower until fork tender
In a medium-sized saucepan, melt the butter over medium heat. Add the onion and garlic and roast until golden brown
Place cauliflower, roasted garlic cloves, shallot half of a cup of milk in a blender. Blend until smooth and no lumps are found
Pour the cauliflower sauce into the same pan that was used to roast garlic. Add the grated parmesan cheese to the sauce and stir until melted and combined. Simmer for 5 minutes on low flame to adjust the consistency of the sauce. Taste the sauce and add salt and pepper to taste
