Cauliflower cheese soup with croutons

• vegetable oil, for frying
• 1 onion, diced
• 2 garlic cloves, sliced
• 2 sprigs of thyme, plus a few extra leaves to garnish
• 1 small cauliflower
• 500ml of milk
• 200ml of water, or vegetable stock
• 150g of cheddar, grated
• 20g of Parmesan, grated (or a vegetarian alternative)
• 1 tsp Dijon mustard
• 1 dash of white wine vinegar
• 1 dash of Worcestershire sauce, (optional)
• salt
• pepper

Parmesan croutons

• 2 slices of bread, diced
• 70g of butter
• 2 sprigs of thyme
• 1 garlic clove, bashed
• 10g of Parmesan, finely grated (or a vegetarian alternative)
• black pepper
• 1 dash of olive oil, for drizzling