Shepherd's Pie gets a luxurious upgrade with a scalloped potato au gratin topping. This hearty dish combines savory ground meat and vegetables with a creamy, cheesy potato gratin for a comforting and flavorful meal.
Get your cooking started by placing a large skillet or Dutch oven over medium heat. Add a drizzle of oil and let it get hot. Once shimmering, toss in the ground meat and crumble it with a spoon as it cooks. Sauté for 5 minutes, stirring occasionally, until nicely browned all over. Remove the browned meat from the pan and set it aside on a plate.
Add the chopped onions and carrots to the same pan along with 1 teaspoon of salt. Sauté for about 7 minutes, stirring occasionally, until they begin to soften and turn translucent.
In the meantime, grab a small mixing bowl and whisk together the flour and wine until you have a smooth paste. Next, whisk in the beef stock to combine everything well.
Now, return the browned ground meat to the pan with the softened onions and carrots. Pour in the prepared wine mixture along with Worcestershire sauce, sugar, and thyme. Bring the entire mixture to a boil, stirring frequently until it thickens slightly.
Add the mushrooms to the pan and season everything with salt and pepper to taste. Cover the pan with a lid and simmer for 45 minutes, allowing the flavors to meld and the mushrooms to cook through.
Scalloped Potato Topping
Grab a large pot and fill it with water. Add a good pinch of salt and bring it to a boil over medium-high heat.
Once the water is boiling, add your sliced potatoes. Gently stir them a bit and let them cook for 4-5 minutes. You want them to be fork-tender, but not mushy.
To prevent the potatoes from overcooking, drain them immediately in a colander. You can even rinse them with cold water to stop the cooking process completely.
Let the potatoes sit in the colander for a few minutes to drain any excess water. Then, spread them out on a plate or baking sheet to cool down completely before using them in your potato salad. This will help prevent them from getting mushy in the final dish.
Building Your Creamy Potato Layers
Get things started by preheating your oven to 425°F (220°C).
Pour your delicious meat filling into a 2-quart baking dish. This will be the base for your creamy potato masterpiece.
Now, it's time for the star of the show - the potatoes! Arrange the sliced potatoes in a single layer over the meat filling. Think of overlapping shingles on a roof - each potato slice should slightly overlap the one before it, creating a neat and even layer.
Once your first potato layer is complete, drizzle half of the heavy cream over it. Season generously with salt and pepper to taste. This creamy layer will add richness and help the potatoes cook through evenly.
Repeat steps 3 and 4 to create another layer of overlapping potatoes and then top it off with the remaining heavy cream. Season again with salt and pepper.
Finally, for that irresistible cheesy goodness, arrange your shredded cheese evenly over the top cream layer.
Now that your potato gratin is beautifully assembled, place the baking dish on top of a rimmed baking sheet (just in case of any bubbling over) and pop it into the middle rack of your preheated oven. Bake for about 30 minutes, or until the top is golden brown and the gratin is bubbling merrily.
Notes
Gentle Handling of Cooked Potatoes:Once cooked, potatoes can become delicate. To preserve their texture and prevent them from breaking apart, avoid pulling them when separating. Instead, employ a gentle sliding motion. This technique will maintain the integrity of the potato pieces, resulting in a more aesthetically pleasing and texturally superior final dish.Utilizing a Rimmed Baking Sheet:When baking any dish, particularly those with a tendency to bubble or overflow, using a rimmed baking sheet is a prudent choice. This simple step can significantly reduce cleanup time. The raised edges of the rim effectively capture any spills or drips that may occur during the baking process, preventing them from burning onto the bottom of your oven. This not only makes cleaning easier but also helps maintain a cleaner and more professional kitchen environment.