Yes, RIJSTAFEL is a Scrabble word!

Letter values in Scrabble US: R 1, I 1, J 8, S 1, T 1, A 1, F 4, E 1, L 1.

Is it a valid word?

RIJSTAFEL is a valid word in the official Scrabble dictionary (US) and the UK Scrabble Dictionary, but not in Words with Friends (ENABLE).

dish originating in Indonesia; a wide variety of foods and sauces are served with rice

Not playable in Scrabble US: RIJSTTAFFEL, RIJSTAFFEL.