Peel onions and garlic and cut into small pieces. Heat the oil in an ovenproof pan. Fry the onion and garlic for 2-3 minutes, turning them over. Add frozen vegetables and 2 tbsp. water, bring to the boil and simmer for about 2 minutes.
Add tomatoes, harissa and cumin and simmer for another 4-5 minutes. Season to taste with salt, sugar and pepper.
Beat the eggs and carefully slide them into the pan. Leave in the preheated oven (electric cooker: 175 °C/ circulating air: 150 °C/ gas: see manufacturer) for approx. 10 minutes. Delicious with baguette bread.