Peel and chop the onions and garlic. Fry in hot oil. Add peas. Drain the corn. Steam both for about 3 minutes. Season with salt and pepper
Whisk eggs and milk. Season well with salt, pepper and nutmeg. Pour about half of it into a greased fat pan (approx. 32 x 39 cm). Sprinkle about half of the vegetable mixture on top. Let them simmer in the preheated oven (electric cooker: 175 °C/recirculating air: 150 °C/gas: level 2) for 10-15 minutes. Then add the rest of the egg milk and vegetables and let it set for another 35-40 minutes
Leave the cake to cool and cut into rhombuses. Garnish with pepperoni, tomato halves and slices of sausage and serve