Peel and finely dice the onions and garlic. Heat the oil in a pan and sauté the onions and garlic. Add peas and fry for about 5 minutes at medium heat.
Drain the corn and after 2-3 minutes add to the peas and cook briefly. Season with salt and pepper. Leave to cool a little. Mix eggs and milk and season with salt, pepper and nutmeg. Grease a fat pan and pour in about half of the egg milk.
Sprinkle about half of the vegetable mixture into the egg milk. Put them into the preheated oven (electric cooker: 175 °C/ circulating air: 150 °C/ gas: stage 2) for 10-15 minutes. Add the remaining egg milk and the remaining vegetables.
Allow to stand for another 35-40 minutes. Let the confetti cake cool down and cut into rhombuses. Garnish as desired with pepperoni, cherry tomato halves, parsley leaves and Kabanossi slices. Arrange on a tierere and serve.
Results in about 42 pieces.