Why Day-Boat Crab Beats Anything Vacuum-Packed

There's a particular pleasure in carrying a paper-wrapped crab home from a harbour fishmonger, still cold from the morning's haul, with the smell of the sea on your hands. If you live near the coast — or you're staying in a cottage for a week — this is one of the simplest and most rewarding suppers you can put together. The trick isn't complicated cooking. It's good sourcing, a light touch, and knowing when to stop fiddling.

Day-boat crab is landed by small vessels that return to port within a day, often within hours. The meat is sweeter, firmer, and noticeably less watery than the pasteurised tubs you'll find in supermarkets. Look for a fishmonger who sells crab that was cooked on the day it was landed. Ask when it was boiled. If they can't tell you, walk on.

For two people, a 1kg to 1.2kg cooked brown crab is about right, or roughly 200g of picked white meat if you'd rather skip the dismantling. Brown crab gives you both the sweet white meat from the claws and legs, and the rich, denser brown meat from the body — both have their place on the plate.

Picking Crab and Samphire at the Fishmonger

Judge a cooked crab by weight and smell. It should feel heavy for its size, with no sloshing inside — that's a sign of a watery, poorly kept crab. The shell should be a deep, rusty orange-red, and the underside clean. A faint whiff of ammonia means it's past its best; fresh crab smells briny and sweet, nothing more.

Samphire is the other half of this supper, and its season is short — roughly June to August in the UK, with the best stuff coming from East Anglian and Channel coast marshes. You'll find two types. Marsh samphire (also called glasswort) is the one you want: bright green, jointed, crisp stems that snap easily. Rock samphire is darker, leafier, and has a stronger, almost medicinal flavour — good pickled, less good steamed.

• Choose samphire with firm, plump stems and a vivid green colour.
• Avoid any that looks limp, brown at the tips, or slimy to touch.
• If your fishmonger only has rock samphire, blanch it twice and use it sparingly.
• Buy more than you think you need — samphire wilts dramatically, and 200g raw serves two generously.

Preparing the Crab Without Wrecking It

If you've bought a whole cooked crab, set aside twenty minutes and a large board. Twist off the claws and legs first, then place the crab on its back and lever the body away from the shell. Scoop out the brown meat into a bowl, discarding the greyish gills (sometimes called "dead men's fingers") and the small sac near the head. Rinse the shell if you want to use it for serving, but don't rinse the meat — you'll wash away the flavour.

Crack the claws with the back of a heavy knife or a rolling pin, working over a bowl to catch every shred. Legs can be rolled firmly with a rolling pin, or split lengthways with scissors. Keep the white meat in one bowl and the brown in another. Cover and chill until you're ready — but no longer than a few hours.

A note on picking: don't pulverise the meat into a paste. You want distinct flakes and chunks, so stop cracking as soon as the shell gives.

Blanching Samphire in Ninety Seconds

Samphire is naturally salty, so you cook it in unsalted water — an important detail that catches plenty of people out. Bring a pan of plain water to a rolling boil, drop in the samphire, and blanch for 60 to 90 seconds. No longer. You're after bright green, tender-crisp stems with a little bite, not a soft green mush.

Drain immediately and plunge into iced water, or run under a cold tap, to stop the cooking dead. Drain again thoroughly. At this point you can toss it with a knob of butter and a squeeze of lemon, or leave it plain and let the lemon butter do the work at the table. A grind of black pepper is welcome; salt is not — samphire brings plenty of its own.

Lemon Butter and the Assembly

Lemon butter for crab should be simple and bright. Melt 100g of good unsalted butter gently in a small pan with the finely grated zest of one unwaxed lemon and a tablespoon of its juice. Add a pinch of cayenne if you like a little warmth, and a tablespoon of chopped flat-leaf parsley. Keep it warm — not hot — so it doesn't split.

To serve, warm the crab meat gently. White meat can go into a pan with a spoonful of the butter for barely a minute, just to take the fridge chill off without cooking it further. Brown meat benefits from a slightly longer turn in the pan, where it thickens and deepens. Pile both onto warm plates, spoon the lemon butter over, and lay the samphire alongside.

Serve with thick slices of crusty bread — a good sourdough or a coastal bakery's bloomer — and a bowl of the lemon butter on the table for dipping. A crisp dry white, a dry cider, or even a light English sparkling wine all work beautifully here.

A Few Practical Notes for Coastal Kitchens

• Keep everything cold until the last moment. Crab deteriorates quickly at room temperature.
• Eat within 24 hours of purchase if you can; day-boat crab is at its peak on the day.
• Don't over-season. Both crab and samphire carry their own salt.
• Use the shells. Simmered with water for twenty minutes, they make a fine stock for a later fish soup.
• Freeze picked white meat if you have leftovers, in small portions, for up to a month.

This is the sort of meal that needs a table near an open window and a view, if you're lucky enough to have one. It takes less than half an hour from fishmonger's paper to plate, and it tastes of exactly where you are. That, more than any technique, is the point of coastal cooking.