Grandmas Good Slow Roasted Beef Sandwiches

There are recipes you make to impress people, and there are recipes you make so you can actually talk to the people you invited. This is the second kind. Slow Roasted Beef Sandwiches are perfect for easy entertaining.

These slow roasted beef sandwiches are my answer to every “we should have everyone over” that comes out of my mouth before I’ve thought it through. The beef roasts low and slow at 250 degrees for most of a day (or I do it overnight) then goes into the fridge overnight, which sounds like a lot of waiting, but it makes slicing the meat so it doesnt fall apart optimal.

Why This Recipe Works

Low heat, long time. Roasting at 250°F for 8 to 9 hours breaks down the connective tissue in the roast without drying it out. Tightly covered with foil, the beef essentially braises in its own juices plus the sauce.

Garlic goes inside, not just on top. Cutting slits all over the roast and pushing slivers of raw garlic into them seasons the meat from the inside out. Every slice gets a little garlic, not just the edges.

Consommé, soy sauce, and Worcestershire make an instant au jus. Beef consommé brings body, soy sauce brings salt and deep savory flavor, and Worcestershire adds that tangy backbone. As the roast cooks, its drippings join the party, and you end up with an au jus that tastes like it took all day, because it did.

The overnight chill is the secret. Here’s the thing nobody tells you: a roast this tender will fall apart the second you try to slice it warm. Wrapping it in foil and refrigerating it firms it up so you can get clean, thin slices. Chilling the au jus also lets the fat rise and harden on top so you can just scrape it off. Two problems solved by doing nothing.

Ingredients

For the roast:

• 8 lb beef chuck roast
• 4 garlic cloves, cut into slivers
• 2 can (10.5 oz) beef consommé
• ¼ cup soy sauce
• 2 tablespoons Worcestershire sauce
• 1/2 teaspoon onion powder
• 1/2 teaspoon garlic powder
• 1/2 teaspoon smoked paprika
• 1/2 teaspoon black pepper

Horseradish mayo:

• ½ cup mayonnaise
• 2 to 3 tablespoons prepared horseradish
• Squeeze of lemon juice
• Pinch of salt

For serving:

• Potato rolls
• Thinly sliced red onion

Instructions

1. Heat the oven to 250°F.
2. Make the sauce. In a bowl, whisk the spices, consommé, soy sauce, and Worcestershire together.
3. Prep the roast. Using a small sharp knife, make slits all over the roast. Push a sliver of raw garlic into each slit.
4. Pour and cover. Place the roast in a roasting pan and pour the sauce over it. Cover the pan tightly with foil. Tight is the key word; you want to trap the steam.
5. Roast low and slow. Roast for 8 to 9 hours at 250°F.
6. Chill the roast. Remove the roast from the pan, wrap it in foil, and refrigerate until firm, ideally overnight.
7. Save the au jus. Pour the pan juices into a container and refrigerate separately.
8. Slice. When you’re ready to serve, slice the cold roast thinly and arrange it back in a roasting pan or Dutch oven.
9. Skim the au jus. Scrape the hardened fat layer off the top of the chilled au jus and discard it. Reheat the au jus and pour it over the sliced beef.
10. Reheat. Warm the meat and sauce together until heated through.
11. Serve. Pile the beef onto potato rolls with sliced red onion and a swipe of horseradish mayo. Keep a bowl of au jus on the side for dipping.

Horseradish Mayo

This is the sauce that makes the slow roasted beef sandwiches fantastic! Rich beef needs something with a little bite, and horseradish mayo brings the heat, the tang, and the creaminess all at once. It takes two minutes, and it’s better made ahead.

Ingredients:

• ½ cup mayonnaise
• 2 to 3 tablespoons prepared horseradish, drained
• 1 teaspoon Dijon mustard
• 1 teaspoon fresh lemon juice
• Pinch of salt
• Freshly ground black pepper

Instructions:

1. In a small bowl, stir together the mayonnaise, horseradish, Dijon, and lemon juice.
2. Season with salt and pepper. Taste and add more horseradish if you like it hot.
3. Cover and refrigerate for at least 30 minutes so the flavors can meld.

Makes: About ⅔ cup, enough for 10 to 12 sliders.

Horseradish Mayo Notes

Start small, then build. Horseradish varies a lot from jar to jar. Start with 2 tablespoons, taste, and work your way up. Horseradish is one of those ingredients that sneaks up on you. One bite is fine, the second bite clears your sinuses.

Use prepared horseradish, not horseradish sauce. Prepared horseradish is grated horseradish root in vinegar and has real kick. “Horseradish sauce” or “creamy horseradish” is already mixed with mayo or cream and is much milder. If that’s what you have, skip the extra mayo and just add a little lemon and pepper.

Drain it. Give the horseradish a gentle squeeze or press it in a fine-mesh strainer to remove extra liquid so your mayo doesn’t get runny.

Fresh is fierce. If you can find fresh horseradish root, grate it on a Microplane right into the mayo with a splash of white vinegar. Grate it in a well-ventilated spot. I’m not kidding.

Make it ahead. Horseradish mayo tastes even better the next day, which fits perfectly with the make-ahead roast. Store it in an airtight container in the fridge for up to 1 week.

Variations:

• Lighter: Swap half the mayo for sour cream or Greek yogurt.
• Herby: Stir in 1 tablespoon finely chopped fresh chives or dill.
• Smoky: Add a pinch of smoked paprika to match the spices on the roast.
• Extra zippy: Add a few dashes of Worcestershire sauce to echo the au jus.

Beyond the sandwich. Use leftovers on burgers, as a dip for fries or roasted potatoes, spooned alongside prime rib, or spread on a turkey sandwich.

These sandwiches are great half-time sliders. Here are a few more crowd favorites from stephaniesdish.com worth adding to the game day rotation:

• Dill Pickle Chip Dip — inspired by the Minnesota State Fair, packed with pickle tang and perfect with chips.
• Iowa Girls Cold Corn Dip — a decadent, cold corn dip straight from a college friend group in Ames, Iowa. Not healthy, extremely delicious.
• Layered BLT Dip — all the flavors of a BLT piled onto a creamy cream cheese base, perfect for crostini or crackers.
• Spinach Dip — the classic sour cream and mayo spinach dip with water chestnuts for crunch, no ranch packet required.
• Hot Reuben Dip — corned beef, Swiss, and sauerkraut baked into a warm, tangy dip in under 30 minutes.

Tips for the Best Slow Roasted Beef

Don’t skip the chill. I know. I know. But if you slice this warm, you’ll get shreds instead of slices. (Delicious shreds, but still shreds.)

Make it two days ahead. This is the ultimate make-ahead party recipe. Roast on day one, chill overnight, then slice and reheat on day two.

Reheat gently. Covered, in a 300°F oven, for about 30 to 40 minutes, or over low heat on the stovetop in a Dutch oven. You’re warming it, not cooking it again.

Upgrade the onions. Raw red onion is classic and gives you that sharp bite against the rich beef, but if you have a jar of my pickled red onions in the fridge, use them. It’s a whole different sandwich.

Keep it warm for a crowd. Once reheated, transfer the beef and au jus to a slow cooker on the warm setting and let people build their own sandwiches.

What to Serve with Roast Beef Sandwiches

These are perfect for game day, cabin weekends, graduation parties, or any gathering where people are hungry and you’d rather not be stuck at the stove. Round out the spread with a creamy pasta salad, a bowl of chips, a crunchy slaw, or a pan of roasted potatoes.

Frequently Asked Questions

What is the best cut of beef for slow roasted beef sandwiches?
Chuck roast is the best choice for slow roasting at low temperatures. Its marbling and connective tissue break down over a long cook, producing tender, flavorful beef. Bottom round or rump roast also work, but they’re leaner and can be less juicy.

Can I cook a roast at 250 degrees?
Yes. Roasting beef at 250°F for 8 to 9 hours, tightly covered, produces extremely tender meat. The low temperature cooks the roast gently and evenly without drying it out.

Why do you refrigerate roast beef before slicing?
Chilling a slow-cooked roast firms up the meat so it slices cleanly instead of falling apart. It also allows the fat in the au jus to solidify so you can easily remove it.

How do I remove fat from au jus?
Refrigerate the au jus until the fat rises and hardens on the surface, then scrape it off with a spoon and discard it before reheating.

Can I make this roast beef in a slow cooker?
Yes. Cook it on low for 8 to 10 hours, then follow the same chill, slice, and reheat steps for the best texture. See instructions below

Here’s a slow cooker section you can drop in right after the oven instructions. The chill-and-slice steps stay the same, so the second half is shortened to point back to them.

Slow Cooker Instructions

No oven? No problem. This roast is just as happy in the slow cooker, and honestly, it frees up your oven for the potatoes (or for nothing at all, which is my favorite oven activity).

1. Make the sauce. Whisk the spices, consommé, soy sauce, and Worcestershire together.
2. Prep the roast. Make slits all over the roast and push a sliver of raw garlic into each one.
3. Load the slow cooker. Place the roast in the slow cooker and pour the sauce over the top. No foil needed; the lid does the work.
4. Cook low and slow. Cook on LOW for 8 to 10 hours, until the beef is very tender. You can cook on HIGH for 5 to 6 hours in a pinch, but LOW gives you a more tender roast.
5. Chill. Remove the roast, wrap it in foil, and refrigerate until firm, ideally overnight. Pour the au jus into a container and refrigerate separately.
6. Slice and skim. Slice the cold roast thinly. Scrape the hardened fat off the au jus.
7. Reheat in the slow cooker. Return the sliced beef to the slow cooker, pour the skimmed au jus over it, and heat on LOW for 1 to 2 hours, until warmed through. Switch to WARM and let everyone build their own sandwiches.

Frequently Asked Questions

Slow cooker tip: Pick a roast that fits in a single layer with a little room around it. A 3 to 4 lb chuck roast fits nicely in a 6-quart slow cooker. And resist lifting the lid to check on it; every peek adds cooking time.

How long does leftover roast beef last?
Stored in its au jus in an airtight container, leftover roast beef keeps in the refrigerator for 3 to 4 days. It also freezes well for up to 3 months.

What rolls are best for roast beef sandwiches?
Soft potato rolls are ideal because they’re sturdy enough to hold juicy beef but tender enough to soak up the au jus without getting tough.