Spaghetti Carbonara with Asparagus and Prosciutto

Ingredients

• • 3/4 lb (340 g) spaghetti or other long pasta
  • 1 onion, chopped
  • 1 garlic clove, chopped
  • 1/2 lb (225 g) asparagus, cut into 1-inch (2.5-cm) lengths
  • 1/4 lb (115 g) prosciutto, thinly sliced
  • 4 eggs
  • 1 1/2 cups (105 g) Parmigiano-Reggiano, freshly grated