01Tinned tomatoes are an easy starting point
Our main recipe for two servings uses 400 g chopped tomatoes with their juice. Do not drain them at the start: the liquid is part of the base. Chop whole tinned tomatoes beforehand or crush them with a spoon. Smaller pieces spread more evenly through the sauce and make it easier to create wells for the eggs.
02Passata for a smooth sauce
Passata makes a sauce without larger pieces of tomato. Start with a similar quantity to the basic recipe and keep an eye on the thickness as it simmers. Products vary, so the same cooking time will not always work. Check the label to see whether salt or herbs have already been added.
03Fresh tomatoes in season
Finely dice ripe tomatoes. Firm, underripe tomatoes are harder to cook down into a flavoursome sauce. If you dislike the skin in the finished dish, you can remove it before chopping. Fresh tomatoes often take longer to soften and reduce than a prepared tinned tomato base.
04Tomato purée is an addition
Tomato purée is highly concentrated. Do not use it to replace the 400 g tomatoes on a one-to-one basis. A small amount can supplement the base, but it will not provide the full volume of sauce needed for four eggs. If the sauce already tastes good, you do not need any extra purée.
05Do not automatically add sugar
First let the onion and pepper soften and the tomatoes simmer in the sauce. Taste after seasoning. Sweetness and acidity vary from product to product, so sugar is not essential. Also take into account any salt already present in the tinned tomatoes, harissa and optional feta.
06Check the consistency before adding the eggs
Use a spoon to make a shallow well. If watery liquid immediately runs into it, continue reducing the sauce uncovered, stirring as it cooks. If the base starts to catch, reduce the heat and add water a tablespoon at a time. Adjust the consistency before adding the eggs: afterwards, it is harder to stir the sauce without breaking them.