"Mereka memanggang daging dengan bumbu."

Translation: They grill meat with seasoning.

[JamesTWils]

We would probably not translate bumbu.

[lockers001]

Grilling happens over an open fire, roasting happens in an oven or similar. Few Indonesians have ovens so roasting would seem less common. Both are; however, correct.

[Coco726609]

Why is barbecueing not accepted?

[lili114354]

just wondering why 'roast' is not an acceptable answer here?
does 'memanggang' have to be translated 'grill'?

[Rick392366]

'panggang' is heating/cooking with coal fire.
Well, at least, that's the KBBI definition.
'roast' and 'grill' should be acceptable I think.
You can roast or grill on open coal fire.