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How Long Do You Cook a 1.2 kg Roast Beef? A Step-by-Step Guide

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Roast beef is a classic main dish for holidays and special occasions. When cooked properly, it emerges from the oven tender, juicy and full of flavor. However, cooking the perfect roast beef can seem daunting, especially when dealing with a large cut like 1.2 kilograms.

In this article, I’ll provide a complete step-by-step guide to cooking a 1. 2 kg roast beef. You’ll learn how to pick the right cut, do the prep work, figure out cook times, come up with seasoning ideas, know when the meat is done, rest, carve it, and more. Let’s get started!.

Overview of 1.2 kg Roast Beef

A 12 kilogram roast beef weighs approximately 26 pounds. Typical cuts of beef that size include

  • Topside roast
  • Rib roast (2-3 ribs)
  • Sirloin tip roast
  • Tri-tip roast

These roasts feed about 4-6 people generally. A 1. 2 kg roast beef works well for a small dinner party or gathering. Larger roasts are better for big crowds.

When shopping choose a roast with good marbling throughout for maximum tenderness and flavor. Look for a thick evenly shaped roast if possible.

Step 1: Remove Roast from Fridge and Let Sit

  • Put the roast beef on a baking sheet or plate after taking it out of the fridge.

  • Allow it to sit at room temperature for 1 hour before cooking. This helps it cook more evenly later.

  • Remove any butcher’s string, netting, or packaging. Pat dry with paper towels.

Step 2: Prepare Aromatics and Seasonings

As the roast sits out, prepare your aromatics and seasonings:

  • Mince 2-3 cloves of garlic and roughly chop fresh herbs like thyme, rosemary, and sage.

  • Grind peppercorns and sea salt for seasoning the beef.

  • Combine and prepare any marinades, spice rubs or pastes.

Step 3: Season the Roast Beef

Just before cooking, generously season the roast all over with salt, pepper and any other aromatics or spices you are using.

  • For simple seasoning, coat thoroughly with olive oil and sprinkle lots of salt and pepper.

  • Or apply a spice rub made with herbs, garlic, oil, pepper, etc. Really coat the entire surface.

  • If marinating, allow to marinate in the fridge up to 24 hours for maximum flavor infusion.

Step 4: Prep the Pan and Preheat Oven

Prepare your roasting pan:

  • Place a roasting rack in a deep pan or baking dish. This elevates the roast and allows air circulation.

  • You can also use a shallow pan and place roast directly on vegetables like onions and carrots.

Preheat your oven to 160°C fan/180°C/gas 4/350°F.

Step 5: Calculate Cook Time

The total cook time depends on the size of your roast and your desired doneness:

  • For rare: 15-20 minutes per 500g
  • For medium rare: 20 mins per 500g
  • For medium: 25 mins per 500g

For a 1.2 kg roast, estimate:

  • Rare: 24-30 minutes
  • Medium rare: 30-36 minutes
  • Medium: 36-42 minutes

These times are for oven roasting at 160°C after searing.

Step 6: Sear the Roast Beef

Once oven is heated, sear roast first:

  • In an ovenproof pan, heat oil over high heat.

  • Add roast and brown well on all sides, 2-3 minutes per side.

  • Searing adds great flavor and color.

  • No need to sear if cooking in a slow cooker.

Step 7: Roast in the Oven

Transfer seared roast to prepared pan and roast:

  • Cook at 160°C until it reaches your desired internal temperature.

  • For medium rare, roast to an internal temp of 60-65°C on a meat thermometer.

  • Use estimated cook times, but always rely on a meat thermometer for accuracy.

  • Baste periodically with pan juices for added moisture and flavor.

Step 8: Remove from Oven and Let Rest

Once it reaches target temp, remove roast from oven and let rest:

  • Transfer to a cutting board and tent loosely with foil.

  • Let rest 15-20 minutes before slicing and serving.

  • This allows juices to redistribute for a tender, juicy roast.

Step 9: Check for Doneness

Double check the doneness of your roast beef:

  • Insert a meat thermometer into the thickest part and verify it has reached your desired internal temp.

  • For rare 125°F, medium rare 130-135°F, medium 140°F.

  • If under, return to oven for additional cooking until it reaches the proper temperature.

Step 10: Carve and Serve the Roast Beef

To carve the rested roast:

  • Use a sharp carving knife to slice against the grain into thin slices.

  • Arrange slices on a serving platter.

  • Spoon over any pan juices or roast beef gravy.

  • Serve immediately while hot, preferably with side dishes like Yorkshire pudding, roasted potatoes, or vegetables.

Follow this step-by-step process for cooking a juicy, flavorful 1.2 kg roast beef. The key is good seasoning, an accurate meat thermometer, and letting the roast rest before carving.

Adapt the method to suit your preferred doneness and seasonings. Soon you’ll be able to cook perfect roast beef any size for Sunday dinners and holidays all year long!

how long do you cook a 1 2 kg roast beef

How to roast a 1.2kg beef topside

FAQ

How long does it take to cook 0.5 kg of beef?

Calculate your cooking time for medium-rare with 20 minutes per 500g or for medium use 25 minutes per 500g. For beef on or off the bone, cook it at 240C/220C fan/gas 9 for 20 minutes, then turn down to 180C/160C fan/gas 4 (not forgetting to take this 20 minutes off the timing you have just calculated).

How long does it take to cook a .5 kg roast beef?

To cook rare, allow 15-20 minutes per 500g of meat. To cook medium allow 20-25 minutes per 500g of meat. To cook well done allow 25-30 minutes per 500g of meat. Use a leave-in meat thermometer for the perfect roast – try this one.

Do you cook roast beef at 325 or 350?

When roasting meat and poultry, set the oven temperature to 325°F (163°C) or higher. Explore the charts below to learn how to get great results every time you cook.

How long does it take to cook a half kilo of beef?

Reduce the heat to 190C/375F/Gas 5 and roast for half an hour per kilo for rare, adding another ten minutes per kilo for medium rare, 20 minutes per kilo for medium, and 30 minutes per kilo for well done. Remove the beef from the oven, transfer it to a carving board and cover with foil.

How long to cook a 1.2 kg roast beef?

When it comes to cooking a 1.2 kg roast beef, the total cooking time will depend on how you want your meat cooked. For rare, you should allow 15-20 minutes per 500g of meat. For medium, allow 20-25 minutes per 500g of meat. And for well-done, allow 25-30 minutes per 500g of meat.

How long do you cook a beef roast in the oven?

The cooking time for a beef roast in the oven can vary depending on various factors, such as the size and cut of the roast, the desired doneness, and the type of oven being used. As a general rule, most beef roast recipes recommend cooking at 350 degrees Fahrenheit for 20-25 minutes per pound of meat.

How long do you cook a pound of roast?

Roast for about 13-15 minutes per pound for rare, 17-19 minutes for medium, and 22-25 for cooked through. Check the meat with a thermometer to make sure it is the temperature you want it–145°F for medium rare, 160°F for medium. (Baste the roast a couple times while cooking and keep an eye on the vegetables.

How long do you cook a medium-rare beef roast?

For a medium-rare beef roast, you should cook it in the oven at 350°F (175°C) for about 20 minutes per pound. However, the exact cooking time can vary depending on the cut of beef roast, its thickness, and your desired level of doneness. It is essential to use a meat thermometer to accurately gauge when the roast is cooked to your preference.

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