Gardener’s Pie with Root Vegetable Mash Recipe
Introduction
Gardener’s Pie with Root Vegetable Mash is a comforting, hearty dish perfect for any season. This vegetarian pie combines a savory vegetable and lentil filling topped with a creamy blend of mashed potatoes and rutabaga for a satisfying meal your whole family will love.

Ingredients
- 1 ½ lb (680 g) potatoes
- ¾ lb (340 g) rutabaga, or other root vegetable such as celeriac or turnip
- 4 tbsp (56 g) butter, softened
- 1 tsp (6 g) kosher salt, plus extra
- 2 – 4 tbsp (30 to 60 ml) heavy cream
- 2 tbsp (30 ml) olive oil
- 1 onion, diced
- 3 stalks celery, diced
- 2 carrots, diced
- ½ lb (227 g) mushrooms, sliced
- 3 garlic cloves, minced
- 1 tbsp (15 ml) chopped fresh thyme, or 1 tsp dried
- 1 tbsp (15 ml) tomato paste
- 1 tbsp (15 ml) Worcestershire sauce
- 1 tsp (6 g) kosher salt, plus extra
- ½ tsp (3 g) pepper
- 1 tbsp (8 g) all-purpose flour
- 1 cup (250 ml) vegetable broth
- 1 can (540 ml) canned lentils, drained
- ¼ cup (60 ml) chopped fresh parsley
- Extra chopped fresh parsley, for garnish
Instructions
- Step 1: Peel and cube both the potatoes and rutabaga. Divide into separate saucepans and cover with water. Season both with a generous pinch of kosher salt. Bring them both to a boil and cook until fork tender. The rutabaga will take about 5 to 10 minutes longer than the potatoes to cook. Drain and keep warm.
- Step 2: Use a potato masher to roughly mash both the rutabaga and potatoes until almost smooth. Add the rutabaga to the potatoes along with the butter, kosher salt, and pepper and mash until smooth. Add 2 tbsp of the heavy cream and mash together. Check the consistency – if it’s still too dry, add the remaining cream. Keep warm.
- Step 3: Preheat the oven to 425°F. Place a wide skillet or shallow braiser over medium heat. Add the olive oil along with the onions. Season with a bit of kosher salt. Sauté for 2 to 3 minutes until the onions begin to soften. Add the carrots and celery and turn the heat to low. Sauté for 5 to 7 minutes, stirring regularly, until the vegetables soften.
- Step 4: Add the mushrooms and cook for another 4 to 5 minutes until tender. When the vegetables are all tender, add the minced garlic and chopped fresh thyme. Sauté for another minute until fragrant. Add the tomato paste, Worcestershire sauce, kosher salt and pepper, and cook briefly.
- Step 5: Stir the flour into the vegetables until fully combined before slowly adding the vegetable broth. Bring the mixture to a boil and cook until thickened. Add the lentils and cook for another 2 to 3 minutes to allow the flavours to blend together. Stir in the parsley.
- Step 6: Transfer the filling to a shallow casserole dish or leave in the braiser. Spoon the mashed root vegetable topping evenly over the filling. Bake for 15 to 20 minutes until the filling is bubbling and the top is lightly browned. Top with a bit more chopped parsley for garnish and enjoy!
Tips & Variations
- For a creamier mash, add more heavy cream or a splash of milk while mashing.
- Swap rutabaga for turnip or celeriac depending on your preference or seasonal availability.
- Add grated cheese on top before baking for a golden, cheesy crust.
- Use smoked paprika or a dash of chili powder in the filling for a smoky, spicy twist.
Storage
Store leftovers in an airtight container in the refrigerator for up to 3 days. Reheat covered in the oven at 350°F until warmed through, or microwave in short intervals to avoid drying out the mash. This pie can also be frozen for up to 2 months; thaw overnight in the fridge before reheating.
How to Serve

Serve this delicious recipe with your favorite sides.
FAQs
Can I make this pie vegan?
Yes, substitute the butter with a plant-based alternative and use a non-dairy cream or milk in the mash. Make sure to use a vegan Worcestershire sauce, as some brands contain anchovies.
Can I use dried lentils instead of canned?
Absolutely. If using dried lentils, cook them according to package instructions until tender before adding them to the filling. This may require adjusting the cooking time slightly.
PrintGardener’s Pie with Root Vegetable Mash Recipe
Gardener’s Pie with Root Vegetable Mash is a comforting vegetarian casserole featuring a hearty filling of sautéed vegetables and lentils, topped with a creamy mash made from potatoes and rutabaga. This dish combines earthy root flavors with fresh herbs and a rich but light texture, perfect for a wholesome and satisfying meal.
- Prep Time: 20 minutes
- Cook Time: 45 minutes
- Total Time: 1 hour 5 minutes
- Yield: 6 servings 1x
- Category: Main Dish
- Method: Baking
- Cuisine: British
- Diet: Vegetarian
Ingredients
Root Vegetable Mash
- 1 ½ lb (680 g) potatoes
- ¾ lb (340 g) rutabaga, or other root vegetable such as celeriac or turnip
- 4 tbsp (56 g) butter, softened
- 1 tsp (6 g) kosher salt, plus extra
- 2 – 4 tbsp (30 to 60 ml) heavy cream
Pie Filling
- 2 tbsp (30 ml) olive oil
- 1 onion, diced
- 3 stalks celery, diced
- 2 carrots, diced
- ½ lb (227 g) mushrooms, sliced
- 3 garlic cloves, minced
- 1 tbsp (15 ml) chopped fresh thyme, or 1 tsp dried
- 1 tbsp (15 ml) tomato paste
- 1 tbsp (15 ml) Worcestershire sauce
- 1 tsp (6 g) kosher salt, plus extra
- ½ tsp (3 g) pepper
- 1 tbsp (8 g) all-purpose flour
- 1 cup (250 ml) vegetable broth
- 1 can (540 ml) canned lentils, drained
- ¼ cup (60 ml) chopped fresh parsley, plus extra for garnish
Instructions
- Prepare Root Vegetables: Peel and cube the potatoes and rutabaga. Place each in separate saucepans, cover with water, and season with kosher salt. Bring to a boil and cook until fork tender, noting rutabaga takes about 5-10 minutes longer than potatoes. Drain and keep warm.
- Mash Root Vegetables: Roughly mash both vegetables with a potato masher until almost smooth. Combine rutabaga with potatoes, add butter, kosher salt, and pepper, and mash until smooth. Incorporate 2 tablespoons of heavy cream and mash together. Add more cream as needed to reach desired consistency. Keep warm.
- Sauté Base Vegetables: Preheat oven to 425°F. Heat olive oil in a wide skillet or shallow braiser over medium heat. Add diced onions, season with a pinch of kosher salt, and sauté for 2-3 minutes until starting to soften. Add carrots and celery, reduce heat to low, and cook for 5-7 minutes until softened, stirring regularly.
- Add Mushrooms and Aromatics: Add sliced mushrooms and cook for another 4-5 minutes until tender. Stir in minced garlic and fresh thyme, sautéing for about a minute until fragrant. Mix in tomato paste, Worcestershire sauce, kosher salt, and pepper, cooking briefly to combine flavors.
- Thicken Filling: Sprinkle flour over the vegetables and stir until combined. Gradually pour in vegetable broth while stirring. Bring to a boil and cook until mixture thickens.
- Incorporate Lentils and Herbs: Add drained lentils to the thickened mixture and simmer for 2-3 minutes to blend flavors. Stir in chopped fresh parsley.
- Assemble and Bake: Transfer the filling to a shallow casserole dish or leave in the braiser. Evenly spoon the mashed root vegetable topping over the filling. Bake in the preheated oven for 15-20 minutes until the filling bubbles and the top turns lightly browned.
- Garnish and Serve: Remove from oven, sprinkle extra chopped parsley on top for garnish, and serve hot for a comforting, nutritious meal.
Notes
- You can substitute rutabaga with other root vegetables like celeriac or turnip for varied flavor.
- Adjust heavy cream in the mash to achieve preferred consistency; less cream for a thicker mash, more for creamier texture.
- For a gluten-free option, replace all-purpose flour with a gluten-free flour blend.
- Worcestershire sauce adds umami but check for vegetarian or vegan versions if needed.
- Leftovers can be refrigerated for up to 3 days and reheated in the oven or microwave.
Keywords: vegetarian pie, gardener’s pie, root vegetable mash, lentil pie, comfort food, British cuisine, healthy casserole

