Chocolate fudge frosting
1.Preheat oven to 180°C (160°C fan forced). Line two 12-hole (⅓-cup/80ml) muffin pans with paper cases.
2.Whisk the water and cocoa together in medium bowl.
3.Beat butter, sugar and vanilla in large bowl with electric mixer until light and fluffy. Beat in eggs, one at a time. Fold in half the combined sifted flours and soda, then half the cocoa mixture, stir in remaining flour mixture and cocoa mixture until just combined.
4.Divide mixture among paper cases, bake about 25 minutes. Cool cakes in pans 5 minutes before turning, top-side up, onto wire racks to cool.
5.To make chocolate fudge frosting. Beat butter in medium bowl with electric mixer until light and fluffy. Add milk, extract, sifted cocoa and half the sifted icing sugar, beat about 5 minutes or until light and fluffy. Add remaining sifted icing sugar; beat a further 5 minutes. Spread frosting over cold cakes; decorate with cachous.