"Indian accompaniments" signifies Indian food-items/preprations available at some basically non-Indian restaurant.

इसका सीधा सादा अर्थ यह है कि अक्सर भारतीय भोजन के साथ सहयोगी व्यंजन के रूप में कुछ चीजें ली जाती हैं. उदाहरण के लिए-सब्जी के साथ चटनी, भाजी, छौंके हुए आलू इत्यादि.
Wikipedia says-
The đal course is usually the most substantial course, especially in West Bengal. It is eaten with a generous portion of rice and a number of accompaniments. In Bangladesh, đal is usually eaten with the fish and meat courses, while in West Bengal it is eaten somewhat beforehand.

A common accompaniment to đal is bhaja (fritters). Bhaja literally means 'deep-fried'; most vegetables are good candidates but begun (aubergines), kumra (pumpkins), or alu (potatoes) are common. Machh bhaja (fried fish) is also common, especially rui (rohu) and ilish (hilsa) fishes. Bhaja is sometimes coated in a beshon (chickpea flour) and posto (poppyseed) batter. A close cousin of bhaja is bôra or deep-fried savoury balls usually made from posto (poppyseed) paste or coconut mince. Another variant is fried pointed gourd as potoler dorma with roe stuffing.

Another accompaniment is a vegetable preparation usually made of multiple vegetables stewed slowly together without any added water