France's cleverest roast — the lamb bastes the potatoes, and nothing is wasted

Before home ovens were common, French villages carried their Sunday dish to the baker — the boulanger — and slid it into his cooling bread oven, the lamb sitting right on top of the potatoes. Every drop the roast let go landed exactly where it should. That's the whole trick, and it still works: thin-sliced potatoes and onions drink up stock and lamb drippings from below, while the roast above comes out blushing medium. One dish, one thermometer, and the best roast potatoes you'll never have to make separately.

2 hrs 40 mins 6 servings Prep 30 minsCook 2 hrs 10 minsMain CourseFrench

Ingredients

  • 1 Your Farmer grass-fed lamb roast (approx 1.5kg, leg or shoulder)
  • 3 cloves garlic, cut into slivers
  • 2 sprigs rosemary, torn into small tufts
  • 1 tbsp olive oil
  • Salt and pepper to season
  • 1.2kg potatoes, peeled and sliced about 3mm thick
  • 2 brown onions, thinly sliced
  • 4 sprigs fresh thyme, leaves picked
  • 40g butter
  • 500ml hot chicken stock

Instructions

For the lamb

Take the lamb out of the fridge 30 minutes before you start. Pierce deep slits all over it, push a garlic sliver and a tuft of rosemary into each, then rub with the oil and season generously.

1 lamb roast3 cloves garlic2 sprigs rosemary

For the potatoes

Heat the oven to 180°C (160°C fan-forced). Butter a large baking dish, then layer the potatoes and onions with the thyme, seasoning lightly as you go and finishing with a neat, overlapping potato layer.

1.2kg potatoes2 onions4 sprigs thyme

Pour over the hot stock until it just reaches the top layer, dot with the remaining butter and bake, uncovered, for 30 minutes to give the potatoes a head start.

500ml chicken stock40g butter

For the roast

Sit the lamb directly on top of the potatoes and roast for 1 hour to 1 hour 15 minutes, until a thermometer in the thickest part reads 57–58°C for medium.

Move the lamb to a board and rest it loosely under foil for 20–25 minutes — it will climb to 60–63°C as it sits. Meanwhile, turn the oven up to 210°C and let the potato top take on deep golden colour.

Carve the lamb thickly and serve it straight over the potatoes — everything the roast gave up in the oven is already in them.

Appears in

Your Farmer CSA grass-fed lamb share — Pack B selection of pasture-raised lamb cuts, vacuum-sealed, NSW & ACT delivery
CSA Pastured Lamb Share
Sale price From $150.00Regular price $162.41

The Village Baker's Roast

Boulangère means "in the style of the baker's wife", and the name remembers a time when the village bread oven did everyone's Sunday roasting. The genius of the dish hasn't aged a day: the potatoes braise in stock from below while the lamb bastes them in drippings from above, so the layers underneath turn silky and savoury while the top crisps like a gratin. The lamb itself gets the gentlest possible ride — sitting on potatoes rather than a rack means no scorched pan base and remarkably even cooking. This is the recipe in the lamb-roast set where a meat thermometer earns its keep: pull the roast from a Your Farmer® lamb subscription at 57–58°C and the rest carries it to a proper rosy medium at 60–63°C. No guesswork, no cutting in to check. And because a leg has a natural taper, the thinner end runs a shade further than the thick end — which conveniently gives everyone at the table the slice they'd have asked for anyway.

Swaps and Variations

The classic French move is a few anchovy fillets dissolved into the hot stock — they vanish completely and leave the potatoes deeply savoury, and lamb and anchovy are old friends. Leeks can take the place of the onions, a splash of white wine can go into the stock, and bay leaves work where thyme doesn't. The method also suits a grass-fed beef roast — same build, same temperatures, a touch longer in the oven for the slightly bigger cut. And if you're buying spuds for it, our seasonal regenerative potatoes were practically grown for the job.

Storage and Leftovers

Lamb and potatoes keep, covered, for 3 days in the fridge. Reheat them together in a 180°C oven so the potato top recovers its edges — the microwave turns the layers to putty. The lamb on its own freezes for up to 3 months; the potatoes don't freeze well, but they rarely survive long enough for it to matter. Best leftover move: chop lamb and potatoes together and fry the lot in a hot pan into a crisp-bottomed hash, with a fried egg on top and no apologies.

Frequently asked questions

Do I need a mandoline to slice the potatoes?

No — a sharp knife and a steady three millimetres is all it takes, about the thickness of a two-dollar coin. What matters is that the slices are even, not that they're machine-perfect, so they all cook at the same rate.

What if my roast is a shoulder cut?

Shoulder is happier past medium, so take the long road: cover the whole dish with foil for the first stage, cook the lamb until it's fork-tender rather than pink — roughly an hour longer — then uncover to brown. The potatoes only get better with the extra time.

Does it have to be chicken stock?

Chicken keeps it light and lets the lamb drippings lead, which is why it's the usual choice. Beef or lamb stock both work and make a deeper, darker dish — just go easier on the salt between the layers, since they're usually saltier.

My potatoes were still firm when the lamb was done — what went wrong?

Usually the slices were too thick or the stock went in cold. Slice at 3mm, heat the stock before pouring, and don't skip the 30-minute head start. If it happens anyway, rest the lamb as normal and give the potatoes that time back in a hotter oven.

0 commentson Boulangere Lamb: Roasted over Potatoes Baked in Stock

Three Simple Steps

A whole table of real food.

Your Farmers grow grass-fed beef and lamb, pastured eggs and the best eco-grown veggies and produce — every item grown to the same ecological standard, every farmer one you can know by name. One subscription, your whole real-food shop.

01

Reserve your share — or try a pack

Subscribe to a share of the harvest, or start with a one-off fixed pack.

02

Make it your own

Pick your delivery rhythm and what's in the box. Skip or cancel anytime — no lock-in.

03

Cook, savour, know your farmer

We deliver in a reusable esky we collect next time. No couriers, no waste.

5.0
Vendor:Your Farmer

CSA Grass Fed Beef Share

Value $169.99
Price $152.00
Vendor:Your Farmer

CSA Pastured Lamb Share

Value $162.41
Price $150.00
Vendor:Your Farmer

"Tucker Box" Budget Beef Pack

Value $196.38
Price $186.00
Vendor:Your Farmer

“Steak King” Premium Beef Box

Value $157.43
Price $149.00
Vendor:Your Farmer

Grass-Fed Beef Sausages, Mince and Diced (SMD) Bundle Pack

Value $272.82
Price $218.00
Vendor:Your Farmer

"Mixed Grill King" Combo

Value $273.56
Price $260.00
Vendor:Your Farmer

"Slow King Beef" Combo

Value $147.43
Price $140.00
Vendor:Your Farmer

"Slow King Lamb" Combo

Value $147.43
Price $140.00
Vendor:Your Farmer

Bulk Grass-Fed Beef - Cut-up Your Way

Price $1,048.00
Vendor:Your Farmer

Bulk Pastured Full Lamb - Cut-up Your Way

Price $495.00

More Recipes

View all

Greek-style grass-fed lamb roast with lemon and oregano served over golden potatoes in a ceramic baking dish.

Greek-Style Lamb Roast with Lemon and Oregano

Lemon, oregano and time — the Greek family-table treatment for the whole cut

Every Greek family has a version of this and none of them are wrong. Garlic, dried oregano and lemon get worked deep into the lamb, potatoes go underneath to catch everything that falls, and the oven runs slow enough that nobody has to watch it. What comes out isn't pink, carve-at-the-table lamb — it's the other thing entirely: golden on top, giving underneath, with lemony potatoes that half the table will fight over harder than the meat. It's Sunday cooking from a country that takes Sundays seriously.

Read moreabout Greek-Style Lamb Roast with Lemon and Oregano

Low-and-slow barbecued grass-fed lamb ribs with a dry-rub bark, sliced on butcher's paper.

Low-and-Slow BBQ Lamb Ribs with Dry Rub

Paprika, brown sugar, patience — American barbecue discipline meets Australian lamb

This is the recipe for the day you've decided the barbecue is the afternoon's entertainment, not just the cooking appliance. No foil, no shortcuts: a paprika and brown sugar rub, a hooded barbecue held low around 140C, and three or so unhurried hours while the fat renders, the spice sets into proper bark and the smell slowly takes over the street. Lamb ribs suit the American low-and-slow treatment better than most people expect — they're smaller and fattier than pork ribs, so you get all the bark in less time. Pour something cold. This one's a sit-outside recipe.

Read moreabout Low-and-Slow BBQ Lamb Ribs with Dry Rub

Grilled grass-fed lamb chump chops sliced over a warm French-style lentil salad with mustard dressing.

Grilled Chump Chops with Warm Lentil Salad

Charred chops over mustardy lentils — the bistro order, made at home

Walk into any honest bistro in France and there'll be lamb with lentils somewhere on the board. It works because the two halves trade favours — earthy lentils soak up the lamb's resting juices, and a sharp Dijon dressing cuts the richness of a properly charred chop. The lentils simmer away on their own for twenty-five minutes while you see to the chops, so the timing looks after itself. Hearty without being heavy, smart enough for guests, and most of it comes from the pantry.

Read moreabout Grilled Chump Chops with Warm Lentil Salad