Why is my lamb roast tough?

Online Answer
Slicing the lamb incorrectly If you cut it incorrectly, you'll end up with tough, chewy meat — even if you cooked it perfectly! ... This is the "grain." They're easy to see in tough cuts of meat like leg of lamb, but harder to see in tender cuts like rack of lamb.
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Not only is it a rich source of high-quality protein, but it is also an outstanding source of many vitamins and minerals, including iron, zinc, and vitamin B12. Because of this, regular consumption of lamb may promote muscle growth, maintenance, and performance. In addition, it helps prevent anemia..
What weight of meat per person to order?Boneless MeatNumber of PeopleBone in meat1lb / 0.45kg2 – 32lb / 0.91kg4 – 53lb / 1.36kg3lb / 1.36kg6 – 74lb / 1.82kg4lb / 1.82kg8 – 96lb / 2.73kg8 more rows.
Some prefer it very rare.
The best are evenly cut slabs similar to beef steaks, but any cut of boneless leg of lamb will work.
LambLAMB SELECTIONSAVAILABLE SIZESSERVINGS (RAW WEIGHT)Rack of Lambup to 8 ribs3-4 ribs per personFrenched Double Ribbed Lamb Chop1/2-3/4 lb.1 per personCenter-Cut Loin Roast3/4-1 lb.1-2 peopleLeg of Lambup to 6 lbs.1 lb. per person3 more rows.