sponge mixturen.(a) a packet of prepared dry ingredients for making a sponge cake;(b) the ingredients of a sponge cake mixed together ready for baking.
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the world > food and drink > food > substances for food preparation > [noun] > batter or cake-mix
battera1475
pancake batter1615
cake mix1913
mix1922
sponge mixture1926
1926–7 Army & Navy Stores Catal. 50/1Sponge mixture..pkt. -/5½.
1962 ‘O. Mills’Headlines make Murder x. 119 She..poured boiling water on her sponge mixture.
1975 Times 10 May 13/4 A sponge mixture that you bake yourself tastes very much nicer than a shop bought one.