Split and fill the cake
with butter icing. Place on the cake board and
brush with apricot jam. Cover with a layer of
marzipan then sugar-paste icing.
Divide the
remaining sugar-paste icing into three pieces and
tint pink, blue and green. Make a balloon template,
roll out the colored sugar-paste and cut out one
balloon from each color. Stick on to the cake with
water and rub the edges gently to round them off.
Tint the royal
icing yellow. With a plain nozzle, pipe on the
balloon strings and a number on each balloon. Using
the star nozzle, pipe a border around the base of
the cake.
Tie the ribbon
round the cake and place the candles on top.