This is a folded pastry filled with ground lamb, chunky portobello mushrooms, parmesan, and a mustard-sour cream egg mixture — baked at high heat until the crust is golden. It takes 50 minutes start to finish and uses one pan for the filling, one baking sheet, and one bowl. That’s the honest reason to make it.
Smart swaps
- Pastry dough: Store-bought shortcrust or puff pastry both work. Puff gives a flakier result; shortcrust holds its shape better and is easier to seal.
- Portobello mushrooms: Cremini or large button mushrooms are a direct substitute — just chop them to roughly 1-inch pieces the same way. They release a bit less water, which actually makes sealing easier.
- Sour cream: Full-fat plain Greek yogurt works in equal measure and behaves the same way in the egg mixture.
- Parmesan: Pecorino romano is a sharper swap that pairs well with lamb. Pre-grated is fine here — skip the extra dish of grating your own.
- Mustard: Dijon and whole-grain both work. Avoid yellow American mustard; it’s too sharp and watery for this filling.
What makes this version work
Two things matter most. First, cooking the lamb only to 50% pink before it goes into the calzone — it finishes to a safe internal temperature of 160°F (71°C) during the 20-minute oven bake without drying out. Fully browning it at this stage almost guarantees a dry, crumbly filling by the time the pastry is done. Second, cooking the mushrooms until they stop releasing steam is not optional. Portobello mushrooms hold a lot of water, and if that water ends up in the egg mixture, it thins out and runs when you try to fold the dough — making a sealed calzone nearly impossible. Get them properly dry in the pan first, then add them to the egg and sour cream mixture.
Troubleshooting
- Filling leaks out during baking: The seam wasn’t tight enough. If pinching alone isn’t holding, wet your fingertip and run it along the edge before folding, then press firmly with a fork all the way around — not just a crimp with your fingers.
- Bottom crust is soggy: The mushrooms went in too wet. Next time, spread them on the pan after cooking and let them cool for 5 minutes before mixing with the egg. Also make sure your oven is fully preheated to 425°F before the calzone goes in.
- Pastry tears when folding: The dough was rolled too thin or got too warm. If it starts to tear, chill it in the fridge for 10 minutes before attempting the fold again.
- Egg wash burns before crust is cooked through: Your oven runs hot. Tent the calzone loosely with foil after the first 12 minutes and check the crust at 18 minutes rather than 20.
- Filling tastes bland: Ground lamb varies in fat content by brand. If yours is lean, the filling will need more seasoning. Taste the cooked mushroom-lamb mixture before it goes into the pastry and adjust salt and pepper then — you can’t fix it after sealing.
Keeping and reheating
Leftover calzone keeps in the fridge for up to 3 days, wrapped tightly or in an airtight container. To reheat, put it on a baking sheet in a 375°F oven for 10–12 minutes — this brings the crust back to something close to crisp. The microwave works in a pinch but the pastry goes soft and a little rubbery, so use it only if you don’t care about texture. For freezing, wrap individual portions in plastic wrap then foil and freeze for up to 2 months; thaw overnight in the fridge before reheating in the oven.
Mushroom and Lamb Calzone
Equipment
Ingredients
- 1 sheet store-bought pizza dough or shortcrust pastry - approximately 14 oz / 400g
Instructions
- Preheat oven to 425°F / 220°C (200°C fan-forced).
- Heat 1 tablespoon of olive oil in a large skillet over medium-high heat. Add the ground lamb, break it up with a spatula, and cook for 3–4 minutes until roughly 50% pink remains — it will finish cooking in the oven. Transfer the lamb to a plate using a slotted spoon, leaving the juices and rendered fat in the pan.1 tablespoon olive oil, 1/2 pound ground lamb
- Reduce the heat to medium. Add the finely chopped garlic to the same pan and cook for 30 seconds until fragrant. Add the portobello mushrooms, roughly chopped into 1-inch (2.5cm) chunks. Cook for 6–8 minutes, stirring occasionally, until the mushrooms have released all their moisture and the pan is dry. Set aside to cool slightly.2 cloves garlic, 3 large portobello mushrooms
- Whisk up 2 eggs and sour cream until combined. Add the fresh chopped parsley, parmesan, pepper, and a pinch of salt. Mix thoroughly.3 medium eggs, 2 tablespoons sour cream, 2 tablespoons parsley, 1/4 cup Parmesan cheese, 1 teaspoon ground black pepper, 1 pinch salt
- Roll out the pastry dough on a lightly floured surface into a roughly 12-inch (30cm) round or oval. Transfer it to a baking sheet lined with parchment paper. Spread the Dijon mustard evenly over one half of the pastry, leaving a ½-inch (1.25cm) border around the edge.1 sheet store-bought pizza dough or shortcrust pastry, 1 tablespoon Dijon mustard
- Add the mushrooms to the egg mixture and combine until the mushrooms are well coated.3 large portobello mushrooms
- Place the lamb on top of the spread mustard. Next, add the egg and mushroom mixture. Be careful as the egg may run.1/2 pound ground lamb
- Carefully lift the unfilled half of the pastry and fold it over the filling to form a half-moon shape. If the filling feels too wet and the egg mixture is running, the mushrooms were not cooked long enough — see tips.1 sheet store-bought pizza dough or shortcrust pastry
- Fold over the bottom dough over the top and pinch together. You may need to use a little water to act as glue between the edges of the dough.
- Beat the remaining egg in a small bowl. Using a pastry brush, brush the egg wash evenly over the top and edges of the calzone. Use a fork to poke 4–5 small holes in the top to allow steam to escape during baking.3 medium eggs
- Place the baking sheet on the middle rack of the oven and bake for 20–25 minutes, or until the crust is deep golden brown. The internal temperature of the filling should reach 160°F / 71°C. Let the calzone rest for 5 minutes before slicing into 4 portions.
Notes
Nutrition
Your questions, answered
Can I make the filling ahead of time?
Yes — cook the lamb and mushrooms up to a day in advance and refrigerate them separately from the egg mixture. Combine everything just before assembling, since the egg mixture will start to break down if it sits with the mushrooms overnight.
How do I know the lamb is cooked through safely inside the sealed calzone?
Ground lamb needs to reach 160°F (71°C) internally. Because the lamb is partially cooked before going in and the oven runs at 425°F for 20 minutes, it will hit that temperature well before the crust is done — but if you want certainty, use an instant-read thermometer inserted through one of the steam holes in the top.
Can I use a different ground meat instead of lamb?
Ground beef works well and has a milder flavor that lets the mushroom and mustard come through more. Ground pork also works but needs to reach 160°F (71°C) internally, same as lamb — the partial pre-cook method in the recipe handles this the same way.
Try these next
- Gourmet Lamb Sausage Rolls
- Wild Venison Mushroom Pies
- Savory Lebanese Lamb Pastries
- Mediterranean Lamb Feta Pie
