Green’s Dictionary of Slang

(Aus.) a damper (a form of unleavened cake, baked in the ashes), mutton (though note cite 1930) and tea.

1930		Central Qld Herald (Rockhampton, Qld) 6 Mar. 62/2: When we got to our farm, we had a bush dinner of salt beef and damper.
1941		Baker Popular Dict. Aus. Sl.
1945		Baker Aus. Lang. 81: The bush dinner, ‘mutton, damper and tea’ (from 1852) [...] featured so often in outback life.
1955		N. Pulliam I Travelled a Lonely Land (1957) 231/1: bush dinner – mutton with damper, q.v., and tea.