Macaroni and Cheese with Chorizo and Corn

Ingredients

• • 1 lb (450 g) macaroni
  • 6 oz (170 g) dried chorizo sausage, diced, or fresh chorizo sausage, casings removed (see note)
  • 1 tbsp (15 ml) olive oil
  • 1/3 cup (75 g) butter
  • 1/3 cup (75 g) unbleached all-purpose flour
  • 4 1/2cups (1.25 litres) milk
  • 3 cups (300 g) sharp white cheddar cheese, grated
  • 2 cups (300 g) frozen corn kernels, thawed
  • ½ cup (40 g) panko breadcrumbs
  • ¼ cup (20 g) fresh Parmesan cheese, finely grated