Cut the cauliflower into small florets.
Add salt to a large pot of boiling water.
Add the florets to the boiling water and cook until tender.
Drain all the excess water using a colander, let it drain for a couple of minutes. This will prevent having a watery mash.
Place all the florets in your food processor or blender and puree.
After a few strokes in the food processor, add the garlic, unsalted butter, and milk.
Continue the puree process until desired consistency and transfer to a bowl.
Taste test, and season with salt and black pepper if needed. Garnish with some chives!