These roasting times are approximate and slight adjustments may be required to achieve the degree of cooking preferred. This is particularly important for larger roasts for which cooking times can vary considerably.
Beef roasting times
Oven temperature: 350°F / 180°C / gas mark 4
Rare
20 minutes per 500g plus 20 minutes
Medium
25 minutes per 500g plus 25 minutes
Well done
30 minutes per 500g plus 30 minutes
Rest for 15 minutes before carving.
Lamb roasting times
Quick Roasting
Oven temperature: 400F / 200C / gas mark 6
25 minutes per 500g plus 20 minutes
Slow Roasting
Oven temperature: 350F / 180C / gas mark 4
35 minutes per 500g plus 30 minutes
Rest for 15 minutes before carving.
The Complete Book 
Now I feel like a roast 🙂
I have just ordered a topside roast from the butcher – 😀
Do you suggest using fan bake method? I know it is faster than normal baking but they said it dries the meat out.
I always use a fan assist when I roast my meats and haven’t had a problem before with the meat drying out – if you are worried about this, try covering your meat with tinfoil for the first half of the cooking. 🙂
I really do love your site Mandy, it is packed with useful information. This is a really good post.
Kath, thank you for such a wonderful compliment – you have made my day! 😀 Part two of the Roasting Times will be posted tomorrow.
I love that you put everything so clearly. I never really think about timing this much before. Can’t wait for part 2 🙂
Thanks Tes, I am so pleased that you are enjoying all the tips. I will be posting part 2 tomorrow morning. 🙂
Great little reference tips Mandy 🙂
Thanks Anna. 🙂 Part 2 coming tomorrow.
this reminds me of my aunt who does not cook! she has to refer to a recipe book on the roasting time for a chicken 🙂
It’s actually amazing how many people are baffled when it comes to roasting. 😉
If God had intended us to follow recipes,
He wouldn’t have given us grandmothers.
~Linda Henley
great tips, perfect for any cook!!
sweetlife
Thanks Sweetlife. 😉