noun
sinewy meat; tough meat with gristle
Refers to meat that contains a lot of tough connective tissue or sinew, often used in stews or slow-cooked dishes.
すじ肉は煮込み料理に向いている。
Sinewy meat is suitable for stewed dishes.
すじ肉を柔らかくするには長時間煮る必要がある。
To tenderize sinewy meat, you need to simmer it for a long time.
筋肉 (きんにく) means 'muscle' (anatomical), while すじ肉 (すじにく) refers specifically to sinewy or gristly meat as food.
Compound of すじ (筋, 'sinew, tendon') and にく (肉, 'meat').