expression, ichidan verb
deep-fry in oil
A straightforward cooking expression; the 油で part explicitly specifies using oil, though 揚げる alone already implies deep-frying.
鶏肉を油で揚げてから、甘辛いソースを絡めます。
After deep-frying the chicken in oil, coat it with a sweet and savory sauce.
揚げる alone means 'to deep-fry'; 油で揚げる is a more explicit phrase often used in recipes or instructions.
Phrase composed of 油 (oil) + で (instrumental particle) + 揚げる (to deep-fry).