INGREDIENTS VANILLA SPONGE CAKE 2 Boxes Vanilla Cake Mix | 2 Cups Water | 1 Cup Sunflower oil | 6 Eggs | Gel/Liquid Food Colours (Red, Yellow, Green and Blue)
BUTTERCREAM ICING 1 Cup Butter, softened | 4 Cups Icing Sugar | 2 Teaspoons Vanilla Essence | 3 to 4 Tablespoons Milk
DIRECTIONS 1 – Heat oven to 180 degrees. Spray 3 20cm round cake pans with cooking spray. 2 – In large bowl, beat cake mix, water, oil and eggs with electric mixer on low speed 30 seconds, then on medium speed 2 minutes, scraping bowl occasionally. Divide batter evenly among 6 small bowls, about 1 cup in each. 3 – Using food colours, tint batter in 1 bowl blue, 1 bowl red, 1 bowl green, 1 bowl yellow, 1 bowl orange (using red and yellow) and 1 bowl purple (using blue and red). 4 – Refrigerate 3 colours of batter until ready to bake. Pour remaining 3 colours of batter into cake pans. 5 – Bake 18 to 20 minutes or until cake springs back when touched lightly in center and begins to pull away from side of pan. Cool 10 minutes. Remove from pans to cooling racks; cool completely. 6 – Wash cake pans. Bake and cool remaining 3 cake layers as directed. 7 – For the icing, in a large bowl, cream butter with electric mixer. Add vanilla. Gradually add sugar, one cup at a time, beating well on medium speed. Scrape sides and bottom of bowl often. When all sugar has been mixed in, icing will appear dry. Add milk and beat at medium speed until light and fluffy. Keep bowl covered with a damp cloth until ready to use. For best results, keep icing bowl in refrigerator when not in use. Refrigerated in an airtight container, this icing can be stored 2 weeks. Rewhip before using. For thin (spreading) consistency icing, add 2 tablespoons water or milk. 8 – Trim rounded tops off cakes to level, if needed. On serving plate, place purple cake layer. Spread with icing to within 1cm of edge. Repeat with blue, green, yellow, orange and red cake layers. Spread a light coat of icing on top and side of cake to seal in crumbs, then ice with remaining icing.
GOOD IDEA Get the look with less effort by having fewer cake layers and use coloured icing in between.