Cauliflower soup with cheese twirls

Ingredients

• 800 g cauliflower, base trimmed and tough core discarded
• 20 g unsalted butter
• 2 large echalion shallots, sliced
• 2 garlic cloves, sliced
• 200 ml whole milk (plus extra for thinning)
• 500 ml fresh chicken or vegetable stock
• 1 tsp olive oil
• 0.2 tsp lemon juice