Vegetarian Lasagne Soup

Start with the vegetable base — onion, garlic, carrot, celery. This is soffritto, or mirepoix if you want the French name, and it's not there for flavour alone; it's there because raw alliums and raw carrot taste sharp and a little bitter, and heat with oil is what converts that sharpness into sweetness. You're not looking for colour here, you're looking for the onion losing its rawness — it goes translucent, loses its bite on the tongue, before anything else happens. Some say you need high heat to "seal in" flavour at this stage — no, because there's nothing to seal; what you're doing is slow enough heat that the sugars have time to develop before the vegetables scorch and turn bitter in the opposite direction. If your hob runs hot, pull it back a notch rather than rushing this — a burnt edge on a sun-dried tomato will sour the whole pot later, because there's no straining it back out.

Sun-dried tomatoes earlier in that sauté than the canned ones is deliberate — they're already concentrated, and a little time in the fat lets their oil-soaked sweetness spread through the base rather than sitting as separate chewy flecks later. If you can't get them, a tablespoon of tomato purée fried briefly in the same pan does a similar job — concentrated tomato cooked in fat before liquid goes in, which is the principle, not the brand.

The two lentils: red lentils are split and hulled, which is why they cook fast and fall apart — there's no coat to hold them together. Beluga (or use Puy/green lentils if beluga's not on the shelf — any lentil with its skin left on behaves the same way) takes the full simmer time to go from firm to yielding, and that's your real timer for the soup, not a clock. Taste one at the 30-minute mark: if it still squeaks a little between your teeth, it needs longer, whatever the number says.

Dried thyme and rosemary go in early, with the liquid, because dried herbs need time and moisture to rehydrate and release their oils — thrown in at the end they just sit on top, gritty and useless. This is the reverse of what you do with the fresh basil, which goes in last precisely because heat destroys its aromatics almost immediately; cook basil for ten minutes and you've made spinach.

Fresh lasagne sheets are a genuine convenience here over dried — if you only have dried, you can still use them, but you'll need to start them a few minutes earlier and check more often, since dried pasta carries almost no moisture and takes properly longer to soften. Either way, break them by hand into rough pieces rather than cutting neat squares — a lasagne soup doesn't need the discipline of a baked one, and uneven pieces actually catch more broth per bite.

On the stock: vegetable stock here is doing what lasagne's meat ragù would otherwise supply — savoury depth. A thin, salty cube-stock will leave the soup tasting flat under the richness of the cheese at the end, so if you're making your own, don't skimp it down to water with a cube dissolved in — simmer it properly, or buy a decent bought one.

Finally, parmesan and burrata are not interchangeable despite looking similar on a shelf — parmesan is the savoury, salty backbone you'd stir through at serving for seasoning depth; burrata is pure cream and fresh curd, added whole per bowl so it melts into pockets of richness rather than dissolving evenly like a grated cheese would. If burrata isn't to hand, a torn ball of fresh mozzarella with a spoon of double cream dropped alongside gets you close — the point is cream plus soft curd, not a specific Italian name on the label. This feeds four properly, more as a starter with bread alongside if you're six round the table after a roast the day before.