012 / 75 · Crisp-Topped and Potato Comfort
Corned Beef and Cabbage Mash-Top Bake
One 8×12 in (20×30 cm) baking dish, at least 3 qt/2.8 L; 4 main-dish portions · Active 35 min · Total 1 hr 30 min
Print recipe · PDFCooked corned beef needs a different approach from raw mince: warm it gently in a cabbage-and-mustard gravy rather than frying it until dry. A ridged potato roof gives the pan its browned finish. This is a useful planned-leftover supper only when the beef is still inside its original safe refrigerated window.
Start with the date, then the chopping
The recipe uses plain fully cooked corned beef from a chilled cooked joint, cut into short shreds. It is not a method for simmering a raw salted joint or opening canned corned beef. Check the original cooking date before you start and count this meal within that storage period. Trim off large hard fat pieces, but do not shred the meat into dust. Short irregular strands stay recognizable in a spoonful and need only enough heat to become hot in the gravy.
Cabbage should be a filling, not steam trapped under mash
Remove the core, slice the leaves narrowly and cook them with onion in a wide skillet. Turn them regularly as the pile shrinks. Let their moisture evaporate before adding flour and stock. A thick lid of potato is a poor place to hide a raw cabbage heap: the leaves would release liquid and could remain firm. Mustard and a small measured amount of prepared horseradish sharpen the cabbage without needing a heavy cheese topping. Use prepared horseradish from a jar, not a spoonful of unknown-strength fresh root.
Use enough mash to cover, then stop
A moderate roof lets the filling stay in balance with the potatoes. Spoon it in small mounds so you can join the surface without dragging meat into it. Fork ridges catch the oven heat and make crisp high points. There is no added salt in the filling because corned beef, stock and mustard are already seasoned. Taste only after the filling has reached its cooked temperature, and serve promptly after the short rest. Any remaining portions still follow the beef’s original clock, even though the mashed potato was made today.
Ingredients
- 1 lb 12 oz floury potatoes, peeled and cut in 1-in/2.5-cm pieces (800 g prepared)
- 7 cups water (1.7 L), for potatoes
- 2 tablespoons butter (30 g)
- 1/3 cup milk (80 ml)
- 1/8 teaspoon fine salt (0.75 g), for mash
- 1 tablespoon neutral oil (15 ml)
- 1 medium onion, thinly sliced (150 g)
- 1 lb 2 oz green cabbage, cored and thinly sliced (500 g prepared)
- 1 tablespoon all-purpose flour (8 g)
- 3/4 cup low-sodium beef stock (180 ml)
- 1 tablespoon whole-grain mustard (15 g)
- 2 teaspoons prepared horseradish (10 g)
- 12 oz fully cooked corned beef from a safely chilled cooked joint, short-shredded (340 g)
- 1/4 teaspoon black pepper
Set out
Oven, 8×12 in (20×30 cm) baking dish, at least 3 qt/2.8 L, Large saucepan, 12-in/30-cm deep skillet, Potato masher, Rimmed baking sheet, Food thermometer
Allergens
Milk, Wheat, Mustard; check stock and prepared-horseradish labels. Check labels and substitutions.
Make it
- Heat the oven to 400°F (205°C). Put the dish on a rimmed sheet. Bring potatoes and their water to a boil in the saucepan; simmer 15–18 minutes until tender. Drain, steam-dry for 1 minute and mash with butter, milk and salt.
- Meanwhile heat oil in the skillet over medium heat. Cook onion 5 minutes. Add cabbage in batches, turning as it shrinks, and cook 12–15 minutes until tender and excess water is gone.
- Stir in flour for 1 minute. Gradually add stock, then mustard, horseradish and pepper. Simmer 2–3 minutes until lightly thickened. Fold in corned beef and heat gently for 3–4 minutes until the filling reaches 165°F (74°C).
- Spread hot filling in the dish. Spoon mash over it in small mounds, join gently and ridge with a fork. Bake 25–30 minutes until the high points are golden and the center and several other places reach 165°F (74°C).
- Rest 5 minutes before serving one-quarter per person.
Leave a clear note for another cook
Label a saved portion with the original beef cooking date and the use-by deadline, not just the day you assembled the bake. A plainly written label is more helpful than relying on memory.
A useful detail
The 90-minute total begins with fully cooked, safely chilled beef. Cooking a raw corned-beef joint is a separate earlier preparation. The potato simmer overlaps the onion-and-cabbage stage.
Another way
- Replace prepared horseradish with 2 teaspoons/10 g extra whole-grain mustard for a gentler variation. Keep the same low-sodium stock and omit additional filling salt.
Keep it well
Refrigerate shallow portions within 2 hours, or 1 hour above 90°F (32°C), at 40°F (4°C) or below. Use by 3 days from the beef’s original cooking, or an earlier use-by deadline; do not add 3 new days after making this bake. Reheat to 165°F (74°C). Freeze promptly cooled portions for up to 1 month for quality only while the original beef is still within its safe window; thaw in the refrigerator.