For the Mashed Potatoes:
- Set cubed potatoes in a colander and rinse under cold water until water runs clear.
- Transfer to a large saucepan and cover with cold water by at least 2 inches.
- Season water with salt until almost as salty as the sea.
- Bring water to a boil over high heat, then reduce heat to medium-low and simmer until a knife easily pierces potatoes with no resistance, 10 to 15 minutes.
- Drain potatoes in a colander, then rinse with hot running water for 30 seconds.
- Transfer potatoes to a large bowl.
- Using a potato masher, food mill, or ricer, mash potatoes with butter.
- Press surface smooth, then press plastic wrap directly against the surface to prevent a skin from forming.
- Set aside until ready to assemble.
Meanwhile,
For the Meat Sauce:
- Place stock in a 2-cup liquid measuring cup, sprinkle with gelatin, and set aside.
- Heat oil in a large Dutch oven over high heat until shimmering.
- Add half of the ground meat and cook, stirring and scraping the bottom of the pot, until well browned, 6 to 8 minutes; use a potato masher or large whisk to break up meat.
- Add remaining meat and cook, breaking up with a masher or whisk, until reduced to small bits, about 3 minutes; lower heat as necessary to prevent scorching. If meat has rendered an excessive amount of fat, use a metal spoon to ladle most of it out, leaving just a few tablespoons in the pot.
- Add onion, carrots, celery, and garlic and cook stirring and scraping the bottom of the pot, until just beginning to soften slightly about 4 minutes.
- Add tomato paste and cook over medium heat, stirring, for 1 minute.
- Add red wine and bring to a simmer over high heat.
- Cook, scraping up any browned bits until almost fully evaporated. Add reserved chicken stock, thyme, bay leaf, Worcestershire, and Marmite, if using.
- Sprinkle flour over ground meat in the pot, then stir in. Bring to a simmer, then reduce heat to low and simmer until sauce is reduced and thick, about 20 minutes.
- Discard thyme sprigs and bay leaf.
- Stir in peas and season with salt and pepper.
To Assemble and Bake:
- Adjust oven rack to center position and preheat oven to 425°F (218°C).
- Before assembling, heat cream in a large saucepan until simmering.
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