Foodista | Recipes, Cooking Tips, and Food News | Frittata with asparagus

Ingredients

• 6 eggs, egg yolk separated from egg whites
• 2 tbs sour cream
• ½ tsp salt
• ¼ tsp ground pepper
• 1 tbs olive oil
• 1 tbs butter
• 500g asparagus, trimmed
• 1 tomato, seeded, diced
• Cheese sprinkle à la fontina*:
• 80 g Gorgonzola cheese, finely grated
• 3 tbs grated Grana Padano
• 3 tbs milk
• 1 tbs cider vinegar