Low Carb Keto Roast Beef

I used to think roast beef was only something you ordered at a deli counter. Growing up, my mom never made it at home – she always said it was “too complicated” for everyday cooking. Looking back, I think she was just intimidated by cooking such a big piece of meat.

But here’s the thing about roast beef – especially a keto version – it’s actually one of the easiest meals you can make. You just need the right cut of meat and a good meat thermometer. No fancy techniques required. And the best part? It makes enough for leftovers, which means lunch is sorted for the next few days.

What Kind of Beef Roast Should I Use?

For this recipe, you’ve got two great options: eye of round or top round roast. Eye of round is typically leaner and slightly more affordable, making it a popular choice for roast beef, while top round (sometimes called inside round) tends to be a bit more tender. Both cuts come from the rear leg of the cow and work really well when you’re aiming for those classic roast beef slices. If you’re shopping at the grocery store and can’t find either cut, bottom round can work as a substitute – just keep in mind it might need a little extra cooking time. The most important thing is to look for a piece of meat with good color and minimal fat marbling, since these lean cuts are perfect for even cooking and clean slicing.

Options for Substitutions

This keto roast beef recipe is pretty straightforward, but here are some helpful substitutions if you need them:

• Eye of round or top round roast: You can swap in sirloin tip roast or bottom round roast. Just keep in mind that cooking times might need slight adjustments based on the cut’s thickness.
• Avocado oil: Any high-heat cooking oil works here – try olive oil, coconut oil, or even beef tallow. Just avoid butter as it can burn at high temperatures.
• Dijon mustard: Stone ground mustard makes a good substitute, or you can use regular yellow mustard in a pinch – though the flavor will be slightly different.
• Prepared horseradish: If you’re not a fan of horseradish or don’t have any, you can skip it in the main recipe. For the sauce, try using extra Dijon mustard or a bit of wasabi paste for that similar kick.
• Powdered garlic: Fresh minced garlic works too – use about 3-4 cloves. You could also use granulated garlic, just use the same amount as powdered.

Watch Out for These Mistakes While Roasting

The biggest mistake when cooking roast beef is not letting the meat come to room temperature before cooking – take it out of the fridge at least 30 minutes prior to ensure even cooking from edge to center. A common error is skipping the crucial resting period after cooking – letting your roast rest for 15-20 minutes allows the juices to redistribute throughout the meat, preventing them from running out when you slice it. To get that perfect medium-rare doneness, use a meat thermometer and remove the roast at 125°F for medium-rare (it will continue cooking during the rest period), rather than relying on cooking time alone. For the best flavor and texture, remember to slice your roast beef against the grain, making your cuts as thin as possible – cutting with the grain will result in chewy, stringy meat that’s less enjoyable to eat.

What to Serve With Keto Roast Beef?

Since this roast beef is already keto-friendly, you’ll want to pair it with low-carb sides that complement its rich, savory flavors. A simple roasted cauliflower or mashed cauliflower makes an excellent stand-in for traditional potatoes – just add butter and herbs to taste. For some green veggies, try sautéed Brussels sprouts with bacon or a fresh arugula salad dressed with olive oil and lemon juice. If you’re feeling fancy, you can also whip up some roasted mushrooms in butter and herbs, which go perfectly with the beef and horseradish sauce.

Storage Instructions

Keep Fresh: Your leftover roast beef will stay good in the fridge for up to 4 days when wrapped well or stored in an airtight container. I like to slice only what I need and keep the rest whole – this helps keep the meat from drying out and maintains its juiciness.

Freeze: This roast beef freezes really well for up to 3 months. Wrap it tightly in plastic wrap, then aluminum foil, or place it in a freezer bag with as much air removed as possible. Pro tip: slice it before freezing for easy portioning later!

Thaw & Serve: When you’re ready to enjoy your frozen roast beef, thaw it overnight in the refrigerator. For the best texture, serve it cold in sandwiches or bring to room temperature. If you want it warm, heat it gently in the microwave with a damp paper towel over it to keep the meat from drying out.

Preparation Time	60-120 minutes
Cooking Time	30-40 minutes
Total Time	90-160 minutes
Level of Difficulty	Medium

Estimated Nutrition

Estimated nutrition for the whole recipe (without optional ingredients):

• Calories: 2500-2800
• Protein: 200-220 g
• Fat: 180-200 g
• Carbohydrates: 10-15 g

Ingredients

for the roast:

• 1 tbsp garlic powder
• 2.5-3 lb eye of round beef roast
• 2 tbsp avocado oil
• 1 tbsp prepared horseradish
• 2.5 tsp sea salt (I use Redmond Real Salt)
• 1 tbsp Dijon mustard
• 0.5 tsp black pepper (freshly ground for best flavor)

for serving:

• low-carb horseradish sauce

Step 1: Season and Prepare the Roast

Begin by removing the roast from the refrigerator.

Sprinkle it generously with garlic powder, salt, and pepper.

Allow the meat to sit at room temperature for 1 hour to help it cook evenly, or if you have time, refrigerate overnight to let the flavors penetrate deeper.

Step 2: Apply the Flavor Rub

In a small dish, mix together the avocado oil, Dijon mustard, and horseradish.

Rub this mixture thoroughly over the entire surface of the seasoned roast, ensuring even coverage.

This will add a delicious crust and additional flavor to the roast.

Step 3: Prepare for Roasting

Place the roast on a roasting pan that allows the juices to collect beneath it, helping to keep the meat moist and promoting even cooking.

Preheat your oven to 500°F.

Step 4: Initial High-Heat Cooking

Once the oven reaches 500°F, place the roast inside and cook it for 10 minutes.

This step will help develop a flavorful crust on the outside of the roast.

Step 5: Lower Heat and Cook to Desired Doneness

After the initial high-temperature searing, lower the oven temperature to 325°F.

Continue cooking the roast for another 20 to 30 minutes, or until the internal temperature reads between 125°F to 130°F for medium-rare on a meat thermometer.

Step 6: Rest and Carve the Roast

Once done, remove the roast from the oven and let it rest for 20 minutes.

Resting allows the juices to redistribute throughout the meat, resulting in a tender and juicy roast.

After resting, carve the roast into slices of your desired thickness and serve.