Place garlic in a large pot of salted water and bring to a boil.

Separate cauliflower into small florets and add to the pot. bring back to a boil, reduce heat to medium high and cook until cauliflower is very tender, about 10-12 minutes.

Drain well, transfer back to the pot and cook over medium high heat, stirring constantly, until dry, about 3 minutes.

Combine garlic, cauliflower, olive oil & buttermilk in a large bowl. Use a potato masher to mash cauliflower until thick and pulpy.

Transfer to a large saucepan and bring to a simmer over medium high heat. Cook until warmed through, about 5 minutes.

Sprinkle with salt & pepper. Sprinkle with parsley, optional.