This is a ground beef casserole built for the slow cooker — browned mince, carrots, celery, and a sauce of red wine, beef stock, tomatoes, and thyme that cooks down over 9 hours into something genuinely rich. The honest reason to make it: you do about 20 minutes of real work, and the rest of the day takes care of itself.
The short version of why this works
Two things matter here. First, browning the beef in batches before it goes anywhere near the slow cooker — this drives off moisture so the meat doesn’t steam into a grey clump, and it builds fond on the pan that carries into the sauce. Second, reducing the wine and stock on the stovetop before pouring the mixture into the slow cooker. Skipping that step leaves you with a thin, boozy liquid at the end of 9 hours rather than a proper sauce. The Marmite is doing quiet work too — a teaspoon adds depth without tasting like Marmite, and it’s worth keeping in the recipe even if it sounds odd.
Storage and reheating
This casserole keeps well in the fridge for up to 4 days in a sealed container — the flavor actually improves on day two once the sauce has had time to settle. For longer storage, portion it into freezer-safe containers and freeze for up to 3 months. Thaw overnight in the fridge rather than on the counter. Reheat on the stovetop over medium-low heat, stirring occasionally, until it reaches a steady simmer throughout — ground beef should hit 160°F (71°C) on a probe thermometer before serving. Add a small splash of beef stock if the sauce has thickened too much during storage. Skip the garnish — not worth the extra dish.
What can go wrong
- Watery sauce after cooking: This usually means the stovetop reduction step was rushed. The mixture needs to visibly thicken before it goes into the slow cooker — if it looks thin on the hob, keep cooking it uncovered for a few more minutes.
- Greasy surface on the finished casserole: Ground beef with a high fat content (above 20%) can leave a noticeable fat layer. Skim it off with a spoon before serving, or refrigerate overnight — the fat solidifies and lifts off cleanly, which is another reason this dish works well as a make-ahead meal.
- Vegetables that turn to mush: Celery breaks down faster than carrot in a 9-hour cook. Cut both into larger bite-sized pieces rather than small dice, and place them at the bottom of the slow cooker bowl where they sit in liquid rather than dry heat.
- Sauce tastes flat or acidic: If the tomatoes or vinegar are coming through too sharply, stir in a small pinch of sugar or an extra half-teaspoon of Marmite at the end — either will round it out without masking the other flavors.
- Beef clumping into large chunks: If the mince wasn’t broken up thoroughly during browning, it can compact in the slow cooker. Break it apart with a wooden spoon as you transfer each batch to the pan, and stir the finished mixture before pouring it over the vegetables.
Slow Cooker Beef Casserole – Rich 9-Hour Mince
Equipment
Ingredients
- 14 oz tin chopped tomatoes - 400g
- 1 teaspoon Marmite
Instructions
- Place the carrots and celery in the bowl of your slow cooker.8 medium carrots, 8 small celery stalks
- Heat the butter and olive oil in a large heavy-bottomed pan over medium-high heat. Brown the beef in 2–3 batches, breaking it into small pieces as it cooks. Transfer each browned batch to a bowl with a slotted spoon. In the same pan, reduce the heat to medium, add the chopped onions, and sauté for 5–6 minutes until soft and starting to colour. Add the garlic and stir for 1 minute until fragrant.2 tablespoons butter, 2 tablespoons olive oil, 2.2 lbs ground beef (minced beef), 2 medium yellow onion, 4 cloves garlic
- Sprinkle the flour over the onion mixture and stir continuously for 1–2 minutes until the raw flour smell disappears. If the flour starts to catch on the pan, add a splash of stock to loosen it. Add the wine a splash at a time, stirring well between additions, then pour in the remaining stock. Bring to a steady simmer and cook uncovered for 8–10 minutes, stirring occasionally, until the liquid has reduced by roughly one-third and coats the back of a spoon.2 tablespoons all purpose flour (plain flour Australia and UK), 1 cup red wine, 2 cups beef stock (beef broth or beef bouillon)
- Add the chopped tomatoes, passata, chilli flakes, red wine vinegar, Marmite, salt, pepper, thyme sprigs, and the browned beef to the pan. Stir well and bring to a gentle simmer. Pour the entire mixture over the carrots and celery in the slow cooker bowl. Give everything a thorough stir, cover with the lid, and cook on low for 9–10 hours.14 oz tin chopped tomatoes, 2 tablespoons passata or crushed tomatoes (tomato puree with seeds removed), 1/4 teaspoon chili flakes (chilli flakes in British English), 2 tablespoons red wine vinegar, 1 teaspoon Marmite, 1 teaspoon salt, 1 teaspoon ground black pepper, 3 sprigs thyme
Notes
Nutrition
Common questions
Can I cook this on high instead of low for a shorter time?
Yes — cook on high for 4 to 5 hours if you need it done faster. The sauce will be slightly less developed than the 9-hour low version, but the beef will be fully cooked and safe to eat at 160°F (71°C).
Can I substitute something for the red wine?
Use an equal amount of extra beef stock with a tablespoon of red wine vinegar stirred in. The sauce won’t have quite the same depth, but it works well and keeps the dish alcohol-free.
Do I have to use Marmite — can I leave it out?
You can leave it out and the dish will still be good. If you want a similar effect without Marmite, a teaspoon of soy sauce or a small amount of tomato paste stirred in at the stovetop stage adds comparable savory depth.
Can I double the recipe for a larger batch?
Yes, provided your slow cooker is large enough — the bowl should be no more than two-thirds full for even cooking. Brown the beef in more batches on the stovetop and allow extra time for the sauce to reduce before transferring everything across.
Is it safe to put the raw beef straight into the slow cooker without browning?
The beef will reach a safe internal temperature of 160°F (71°C) during the long cook either way, so it is technically safe. However, skipping the browning step produces noticeably greasy, pale meat and a much thinner sauce — the stovetop step is worth the extra pan.
More mince recipes to try
- Beef Lombardi Casserole Recipe
- Hearty Beef Cauliflower Bake
- Hearty Beef Mushroom Stroganoff
- Hearty Beef Kale Soup
