Shepherd's Pie

A low FODMAP shepherd's pie of ground lamb, carrots, parsnip, peas, thyme, and rosemary under low FODMAP mashed potatoes.

Prep 30 min

Cook 1 hr

Serves 6

Gluten-free

Ingredients

Filling

• 2 tablespoons garlic-infused olive oil
• 1/2 cup scallion greens, thinly sliced (green tops only)
• 2 medium carrots, finely diced (about 1 cup)
• 1 small parsnip, finely diced (about 150 g; roughly 25 g per serve)
• 1 1/2 pounds (680 g) ground lamb (or ground beef)
• 1 teaspoon salt, plus more to taste
• 1/2 teaspoon freshly ground black pepper
• 2 tablespoons tomato paste
• 1 tablespoon coconut aminos (in place of Worcestershire)
• 1 teaspoon fresh thyme leaves
• 1 teaspoon fresh rosemary, finely chopped
• 1 bay leaf
• 1 1/2 cups low-FODMAP chicken broth
• 1 tablespoon cornstarch mixed with 2 tablespoons cold water
• 2/3 cup (about 90 g) frozen green peas (about 15 g per serve)

Topping

• 1 batch low-FODMAP mashed potatoes (about 2 1/2 lb / 1.1 kg potatoes)
• 2 tablespoons unsalted butter, melted, for brushing
• Freshly ground black pepper, to finish

Instructions

Start the Mash

1. Start the mashed potatoes first so they're ready when the filling is done. Peel, chunk, and boil the potatoes while you work on the filling below. Finish the mash with butter and warm lactose-free milk per the linked recipe, then keep it covered and warm.

Build the Filling

1. Warm the garlic-infused oil in a large oven-safe skillet or Dutch oven over medium heat.
2. Add the scallion greens, carrots, and parsnip. Cook, stirring often, for 6 to 7 minutes, until the vegetables soften at the edges.
3. Push the vegetables to one side. Add the ground lamb to the open space and break it apart with a wooden spoon.
4. Season with salt and pepper. Cook, stirring occasionally, for 8 to 10 minutes, until the lamb is browned and any liquid has cooked off. Tip out any excess fat if the lamb is very fatty; a couple of tablespoons left in the pan is fine.

Make the Gravy

1. Stir in the tomato paste and cook for 1 to 2 minutes, until it darkens and coats the meat.
2. Add the coconut aminos, thyme, rosemary, and bay leaf. Stir for 30 seconds.
3. Pour in the chicken broth and scrape up any browned bits from the bottom of the pan. Bring to a simmer and cook for 8 to 10 minutes, until the liquid has reduced by about a third.
4. Whisk the cornstarch slurry again and stir it in. Simmer for 1 to 2 minutes more, until the gravy thickens to the consistency of a loose stew. Stir in the peas and cook for 1 minute, just to warm them through.
5. Fish out the bay leaf. Taste and adjust salt and pepper. The filling should be assertively seasoned; the mash on top will mellow it.

Assemble and Bake

1. Heat the oven to 400°F (200°C).
2. If your skillet isn't oven-safe, transfer the filling to a 9x13-inch (about 3-quart) baking dish and spread it level. Otherwise leave it in the pan.
3. Spoon the mashed potatoes over the filling in dollops, then spread gently to the edges so the potato meets the sides of the dish and seals in the filling. Drag the tines of a fork across the top in ridges; the peaks crisp up beautifully.
4. Brush the top with melted butter and grind over some black pepper.
5. Bake for 25 to 30 minutes, until the gravy bubbles up around the edges and the potato peaks are deeply golden. If the top isn't browned to your liking, slide it under the broiler for 1 to 2 minutes, watching carefully.
6. Let it rest for 10 minutes before serving. This sets the gravy and keeps it from running on the plate.

Tips & Substitutions

• Lamb is traditional; beef works. Shepherd's pie is lamb and cottage pie is beef, and both work as plain, unseasoned ground meat. Pre-seasoned blends and most sausage meat carry onion or garlic powder.
• Check the Worcestershire label, or skip it. Lea & Perrins and most supermarket brands list garlic or onion, which doesn't suit this recipe. Coconut aminos plus a pinch of extra salt covers the umami and tang instead.
• Keep the parsnip and peas measured. Parsnip is low-FODMAP at 75 g per serve, and 150 g across 6 servings is 25 g each. Green peas have a small low serve of about 15 g (1 tablespoon), so the recipe uses 90 g across 6 portions; don't swap in sweet potato, which is low only at 75 g.
• Cornstarch thickens cleanly. Wheat-flour gravies bring in fructans, while a cornstarch slurry is low-FODMAP, gluten-free, and thickens in under 2 minutes. Arrowroot or tapioca starch work the same way.
• Make ahead. Assemble the pie through step 4, cover, and refrigerate for up to 24 hours. Bake cold from the fridge for 35 to 40 minutes instead of 25 to 30, until the center is 165°F (74°C).
• Brown the top under the broiler. If the peaks aren't golden after the bake, 1 to 2 minutes under the broiler crisps them. Don't walk away; it goes from golden to scorched in seconds.

Why This Works

Garlic-infused oil and chicken broth carry the aromatics. Both the infused oil and the chicken broth are built to deliver garlic-and-onion flavor without the fructans. They cover the savory base that a classic shepherd's pie gets from sauteed onion and garlic cloves.

Plain ground lamb avoids hidden seasonings. Plain ground lamb (or beef) is low-FODMAP in typical serving sizes. Pre-seasoned blends, meatloaf mixes, and most sausage meats carry onion or garlic powder, so start from plain and build the seasoning in the pot.

Carrots plus a small amount of parsnip do the mirepoix work. Carrots are low-FODMAP in typical serves and pull sweetness into the gravy. A small parsnip adds the earthy, almost-sweet depth that onion usually provides, at 25 g per serving.

Potato mash seals the filling. Monash rates yellow and red potatoes as low-FODMAP in typical serving sizes, which means a mash topping has real headroom. The linked mashed potatoes recipe uses butter and lactose-free milk to keep the topping creamy without the lactose load of standard milk.

Storage

Refrigerate leftovers in a sealed container for up to 3 to 4 days at 40°F (4°C) or below. Reheat single portions in the microwave for 2 to 3 minutes, or cover the whole dish with foil and warm in a 350°F (175°C) oven for 20 to 25 minutes. Shepherd's pie freezes well: assemble unbaked in a foil pan, wrap tightly, and freeze for up to 2 months. Bake from frozen at 375°F (190°C) for 60 to 70 minutes, covered for the first 40, until the center is hot and the top is browned.