Smoked Mackerel with Frittata

Name: Smoked Mackerel with Frittata
Ingredients: 10 g Butter; 1 Spring Onion In Thin Slices; 2 Tomatoes In Small Cubes; tsp Rock Salt; Freshly Ground Pepper; 3 Eggs; 100 ml Milk; 25 g Grated Cheddar Cheese; 1 Smoked Mackerel; 2 Slices Rye Bread; Fresh Dill Sprig; Freshly Ground Pepper

Smoked mackerel with frittata is a classic Danish lunch with an Italian twist. This dish is perfect served with a slice of rye bread.