Primavera frittata

Name: Primavera frittata
Ingredients: 1 large brown onion (200g), chopped finely; 2 clove garlic, crushed; 2 medium potatoes (400g), trimmed, chopped coarsely; 170 gram asparagus, chopped coarsely; 2 medium zucchini (240g), sliced thinly; 2 eggs; 6 egg whites; 1/3 cup (80ml) skim milk; 1/3 cup finely chopped fresh herbs (see tips); 1/2 cup (60g) frozen peas; 1 1/2 tablespoon finely grated parmesan cheese; 1 tablespoon fresh dill sprigs