Parsnip and Swede Soup with Parmesan Crisps

Ingredients

• 2 tablespoons vegetable or olive oil
• 1 brown onion, finely chopped
• 2 carrots, peeled, thinly sliced
• 2 celery sticks, finely chopped
• 500 grams swede, peeled, coarsely chopped
• 3 parsnips, peeled, coarsely chopped
• 1 teaspoon dried thyme leaves
• 3 small chicken stock cubes
• 1/3 cup thickened cream, plus 1/3 cup extra
• 1 cup freshly grated parmesan
• 1 small cured chorizo sausage, finely chopped