Cut the larger florets in half or quarter so they're all about the same size.

Add cauliflower and garlic into a large pot of boiling water and cook for 10 minutes until very soft.

Scoop out a mug of cooking water.

Drain well, then transfer to food processor.

Add remaining ingredients, starting with no water, blitz until smooth. (Use handheld blender stick if you don't have food processor)

Use reserved cooking water to adjust consistency to taste and help puree smooth.

Adjust salt and pepper to taste

Transfer to serving bowl, drizzle with melted butter and garnish with parsley if desired.

Serve as a side with anything that you'd usually serve with mashed potato!