The King is as big as your hand and would sit happily in a hamburger bun. The grading names have been trademarked.
Marshall wants his molluscs to be recognised as the Barossa Valley of the sea.
"We are celebrating nature's seafood harvest," he says. The point of difference is their flavour, which is another way of saying that they would hold their own against ours.
The insouciant Mr Marshall is among the line-up of people we meet on a five-day food discovery tour of South Australia. It is like a travelling farmers' market at which you are the honorary guest.
Every meal, every wine, every ingredient, is brought, made or grown - or all three - by those now present.
We are covering mammoth distances in minimal time thanks to the provision of a private jet, which ferries us throughout. At night we are tucked up like royalty.
Yesterday we were at Kangaroo Island. It sits at the bottom of the world.
Most of the roads are dust and when you finally reach the end of one of them, you come to the expanse that is the domain of Nick Hannaford. His family owns Life Time Retreats, a holiday destination where you have no choice but to get away from it all.
Roughing it? Hardly. Remote? Definitely. "Room service" here means you get your meal delivered by four-wheel drive.
There are three mini-palaces in which to stay: the stone house, the cliff house and the sky house. I get the sky house, which is at the highest point of the property.
Outside there is nothing but, well, sky. And sea. For all that isolation, there is abundant luxury within.
I have never before parked myself in a Villeroy & Boch bath - which has a room solely dedicated to its presence. A phone call announces the imminent arrival of the 4WD. It will drive me to dinner: a seat at the chef's table - in the Hannaford shearing shed.
They tend to understate things on the island: it has been decked out in a manner most stylish and warm. We gather at the table and meet some of the locals. Dan, who started KI olive oil, has brought his own supplies. So has Andy from Southrock lamb. We drink Cape D'Estaing Winery's finest. Later in the night, Hannaford gets out the dress-up box; Andy his guitar.
Hannaford must be the tallest man I have ever met.
"I'm nearly six foot eight," he says. As if that wasn't quite enough. Tomorrow he will take us for a walk on his beach and we will gather up shellfish and wild greens for him to cook at the water's edge. Think of the composer who writes a classic piece of music and then conducts a world-class orchestra in the best concert hall there is. And then pull up a seat at the table with Jim and Jan Angas.
Here in South Australia, they are the Barons of the Barossa. Jim's forbears (he's sixth-generation) owned a large swathe of the valley; the nearby town is named after them.
In these times, the family still has a prominent land-holding and a stature to match. They take us up to the top of their highest hill to survey their farm. Later I will learn the hill was Mt Edelstone, from where some of the many wines of this region spring. If the weather weren't in the way we would have opened a bottle right on the spot.
Instead we head off to an old stone building within the farm precinct. Inside we take shelter by the coal range, which is all fired up and in the process of producing a range of breads to go with the meats from Angas beasts. That is just for starters.
Inside the main bit of the building, John lights the fire and we feast on both their stories and their foods. The wine (Hutton Vale) is from their grapes. The lamb is all theirs. The asparagus has just been picked. Even the chutneys are the fruits of their very own efforts. It is all so rustic in a thoroughly five-star way.
And so it goes on. Downtown we meet Victoria McClurg from the Barossa Valley Cheese Company. McClurg used to be a winemaker; now she has gone a different whey. There is wine-tasting: from tin sheds to big names galore.
This, then, is but a taste of what they call a flying food safari. It puts a new hue on what you thought was familiar in foods and wines. It grants entree to the very heart of their origin. It achieves an impossible mix: of visiting the locals, living like a king and sometimes forgetting that you are neither.
Geraldine Johns travelled South Australia with Outback Encounter.
- DETOURS
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