How Long To Cook Roast Beef 1.3 KG? The Ultimate Guide

Roast beef is a beloved centerpiece for many holiday meals and special occasion dinners. When cooked properly it emerges from the oven tender, juicy and full of flavor. However cooking roast beef can be intimidating, especially when dealing with a large cut like 1.3 kg. How long should you cook it for? And what’s the best method to ensure perfect results?

In this comprehensive guide, we’ll walk through everything you need to know to cook a mouthwatering 1.3 kg roast beef. Whether you prefer your beef rare, medium or well done, we’ve got you covered.

Calculating Cooking Time for a 1.3 KG Roast

The cooking time for roast beef depends on a few key factors

• Doneness – Rare beef takes less time than well done.
• Cooking method – Roasting in the oven takes longer than grilling or pan searing.
• Temperature – Higher oven temps speed up cooking time.
• Size and shape – Larger, thicker roasts need more time.

Here are general guidelines for 1.3 kg roast beef:

• Rare: 15-20 minutes per 500g
• Medium: 20-25 minutes per 500g
• Well done: 25-30 minutes per 500g

For a 1.3 kg roast, that works out to:

• Rare: About 45-60 minutes
• Medium: About 60-75 minutes
• Well done: About 75-90 minutes

However, shape and thickness will impact these estimates. We recommend using a meat thermometer to determine doneness rather than relying solely on time.

Choosing the Right Cut

For roast beef, certain cuts are better suited than others. The best cuts include:

• Rib roast – Taken from the rib primal, this is the classic cut for prime rib. It’s marbled, tender and flavorful.

• Rump roast – This leaner cut is often used for deli roast beef. It can also be roasted at home.

• Top round – Top round roast delivers good flavor at a lower cost than premium cuts. Slow roast for maximum tenderness.

• Chuck roast – From the shoulder, this budget-friendly cut benefits from braising to break down connective tissue.

Aim for cuts with marbling and a thick layer of fat to protect the meat and keep it tender during roasting.

Preparing the Roast Beef

Proper prep is key for even cooking and maximum flavor:

• Bring to room temp – Remove roast from fridge 60 minutes before cooking.
• Preheat oven – Heat oven to 325°F.
• Season – Generously season with salt and pepper.
• Add moisture – Coat very lean roasts with oil to prevent drying out.
• Use a rack – Place meat on a wire rack atop a baking sheet for air circulation.

Calculating Oven Temp and Time

To achieve an evenly cooked 1.3 kg roast:

• Preheat oven to 220°C/425°F.
• Sear roast on all sides in a skillet to enhance flavor.
• Roast at 220°C for 20 minutes to brown the exterior.
• Reduce heat to 160°C/325°F and continue roasting until done.
• Check temperature 30 minutes before estimated finish time.
• Total roasting time depends on desired doneness – see estimates above.

For bone-in roasts, extend cooking time slightly since the bone acts as an insulator.

Checking for Doneness

When nearing estimated cooking time, start checking your roast beef:

• Use a meat thermometer – Insert into thickest part avoiding bone.
  • Rare: 120-125°F (49-52°C)
  • Medium rare: 130-135°F (54-57°C)
  • Medium: 140-150°F (60-65°C)
• Slice to check color – Rare beef is bright red, medium is light pink.
• Test for firmness – Rare beef is soft and spongy, medium is slightly firmer.

Allow the roast to rest before carving to complete the cooking process.

Letting It Rest

Never skip this crucial resting period!

• Rest for 15-20 minutes – This allows juices to redistribute evenly.
• Keep it warm – Loosely tent foil over the roast while it rests.
• The temp will rise – It continues cooking during resting period.

Resting makes the beef more flavorful andtender for carving.

Carving the Roast Beef

Follow these steps for beautiful slices:

• Use a sharp carving knife and fork to steady meat.
• Slice across the grain for tenderness.
• Cut off thin slices as needed to prevent drying out.
• Don’t forget to trim off flavorful bits for stew meat!

With the right cut, proper prep, and careful roasting, your 1.3 kg roast beef will deliver incredible depth of flavor in every juicy, tender bite. Just follow the guidelines for your preferred doneness level, use a meat thermometer for accuracy, and be sure to let it rest before serving. In no time, you’ll be carving impressive roast beef worthy of any special meal. Enjoy!