Soup with Parmigiano Reggiano, easy roasted sweet potatoes and cauliflower - South Africa

Ingredients

• 4 large sweet potatoes
• 1 large cauliflower
• 2 litres of vegetable stock
• 250 ml of full cream milk
• 40 ml extra virgin olive oil
• 30 g Parmigiano Reggiano flakes
• 1 large onion, peeled and chopped
• 1 head of garlic
• 1 rind of Parmigiano Reggiano
• 1 handful of fresh parsley
• 1/2 tsp garam masala
• 1/2 tsp nutmeg