If you’re making your own tomato purée, preheat the oven to
180°C/Gas 4. Lay the tomato halves, cut side up, in a single layer in a large, deep baking tray. Scatter over the garlic and thyme, tuck in the bay leaves, trickle over the oil and season with salt and pepper. Roast in the oven for about an hour, maybe a bit longer, until the tomatoes are completely soft and pulpy, and starting to crinkle and caramelise on top. Remove and leave to cool off for half an hour or so. Then tip them into a large sieve and rub through with a wooden spoon, or use a mouli. Discard the skin and pips. Your sauce is now ready to use. If you haven’t produced the full 750ml you need here, just increase the quantity of stock to compensate.
To make the soup, heat the oil in a large saucepan over a medium-low heat. Add the onion and sauté for 8–10 minutes until soft. Stir in the pearl barley or spelt, then add the stock and 750ml tomato purée or passata. Bring to a simmer and cook very gently, uncovered, until the barley or spelt is tender. Barley should take 30–40 minutes; spelt will only need 20–25 minutes.
Taste and season with salt and pepper as needed, then ladle the soup into bowls and serve. A trickle of good extra virgin olive oil on top will not go amiss.
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