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Sweetcorn Chowder with Charred Cob Broth and Chive Oil
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A sweetcorn plant gives you its ears for about ten days, and the sugars in those kernels start converting to starch the moment the stalk is cut — which is why garden corn tastes like nothing from a supermarket shelf. This chowder uses the whole cob: kernels for sweetness, stripped cobs simmered into a broth that carries more corn flavour than the kernels themselves. Made now, at peak harvest, it needs almost nothing else.
12 oz (350 g) waxy potatoes such as Charlotte, Yukon Gold or new potatoes, cut into 1/2 in (1.5 cm) dice
1 fresh bay leaf (or 2 dried)
2 cups (500 ml) whole milk, or unsweetened oat milk
1/2 cup (120 ml) double cream / heavy cream
1 small green chilli, finely sliced (optional)
1 bunch chives (about 1 oz / 25 g)
1/3 cup (80 ml) mild olive oil or sunflower oil, for the chive oil
Fine sea salt and freshly cracked black pepper
The Recipe
Stand each cob upright in a wide bowl and cut down the sides with a heavy knife, taking the kernels off in slabs rather than sawing at them — you want to leave the tough kernel bases on the cob, because they turn woody in the mouth. Then scrape every stripped cob hard with the back of the knife: the cloudy milk that runs out is pure starch and sugar, and it is what makes this chowder thicken without flour. Do not skip this step.
Snap the bare cobs in half and char them directly over a gas flame, on a grill, or under a hot broiler for 4–5 minutes, turning until patched with dark brown and smelling toasted, like popcorn. Raw cobs give a thin, grassy broth; charred ones give caramel and smoke.
Put the charred cobs in a saucepan with 4 cups (1 litre) of cold water and the bay leaf. Bring to a bare tremble — not a rolling boil, which pulls bitterness from the pith — and simmer 25 minutes. The liquid should reduce by about a quarter and turn pale gold. Strain and discard the cobs.
Meanwhile, melt the butter in a heavy pot over medium-low heat and sweat the onion and celery for 10 minutes with a pinch of salt, stirring often. They should go translucent and slump, with no golden edges at all: browning here would push the soup towards French onion territory and mask the corn.
Add the potatoes, three-quarters of the kernels and all the scraped corn milk, then pour in the hot cob broth. Simmer uncovered for 12–15 minutes, until a potato piece crushes against the side of the pot under light pressure but still holds its shape. Overcooked potato disintegrates and makes the chowder cloudy and pasty.
Pour in the milk and bring back to just below a simmer — you should see wisps of steam and the odd bubble at the edge, never a boil, which would make the milk grainy. Blend about a third of the soup (a ladleful at a time in a jug blender, or a few pulses with a stick blender held in one spot) and stir it back in. This gives body while leaving whole kernels and potato to bite on.
Blanch the chives for 10 seconds in boiling water, squeeze dry, and blitz with the oil and a good pinch of salt for 45 seconds until vivid green; strain through a fine sieve if you want it clear. Blanching sets the chlorophyll so the oil stays emerald instead of turning olive-drab within the hour.
Stir the remaining raw kernels and the cream into the hot chowder and let it stand off the heat for 3 minutes — the residual heat cooks them just enough to burst sweetly against the soft ones. Season with salt until the corn sweetness suddenly reads as savoury, then finish each bowl with chive oil, cracked black pepper and sliced green chilli.
