What is a saddle of lamb, exactly?
It is a classic roast cut from the lamb’s back that includes both loins still attached, and it usually includes some of the backbone/spine (how much bone and structure you get varies by butcher and region). You might also see it sold as a double loin roast.
Can I make this with a boneless lamb loin roast instead?
Yes. If you can only find a boneless lamb loin roast, use the same crust and method. It will usually cook a little faster than bone-in, so start checking temperature early.
Do I need to tie it with kitchen twine?
Highly recommended. Tying helps it roast evenly and keeps the shape tidy for carving. If your butcher already tied it, you are winning.
Twine tip: If it comes tied, keep the twine on during roasting and resting. Remove it right before slicing.
What internal temperature should I aim for?
For most people, lamb shines at medium-rare. Pull from the oven at 125°F for medium-rare (it should rise to about 130 to 135°F as it rests). For medium, pull at 135°F.
If you like it rare (cool red center), pull at about 120°F. Carryover heat varies with size and bone-in versus boneless, so your finish temp may climb anywhere from 5 to 10°F.
How do I keep the crust from falling off?
Pat the lamb dry, sear it, then brush on Dijon and press the breadcrumb mixture firmly. Also, let it rest after roasting before slicing so juices settle and the crust sets.
What can I use instead of wine in the sauce?
Use chicken broth or lamb stock plus a small squeeze of lemon at the end. You still get a bright finish without alcohol.
Any shopping tips if I cannot find a saddle?
Ask the butcher for a double loin roast or “two loins attached,” either bone-in or boneless. This recipe works for both. Just start checking temperature sooner for boneless.
How do I carve it if there is a backbone?
If your saddle is bone-in, you can first run your knife along the backbone to separate the two loins (your butcher may have already done part of this). Then slice each loin into thick pieces. If it is boneless, just slice across the roast into thick slices.