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Hot Tub Cake

This tutorial was uploaded as part of the Renshaw ‘Battle of the Bakes’ competition.

A fun cake to celebrate an important milestone birthday 🎉 complete with lots of personal detailing.

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Time to make

Skill Level



30 people

Baking ingredients

  • 600 g Self raising flour
  • 600 g Butter or margarine
  • 600 g Caster sugar
  • 12 Eggs
  • 1 tsp Vanilla extract
  • 750 g Icing sugar
  • 375 g Butter
  • 3 tbsp Jam

Decorating ingredients

  • 500 g Renshaw White Ready to Roll Icing
  • 500 g Renshaw Chocolate Flavour Ready to Roll Icing


Step 1

Start by baking 3 x 8" square vanilla sponges. Once cooled (I like to wrap and leave overnight so they are easier to work with) level, fill with jam and buttercream and stack.

Step 2

Once stacked, cover the whole cake with buttercream and put in fridge to chill.

Step 3

To decorate, roll out some white sugarpaste to cover top of the cake. Airbrush shades of blue to create a water effect.

Step 4

For the sides, roll four 8" x 3" panels out of the chocolate flavoured fondant and press on a wood effect impression mat and attach to sides of cake. Add a roll of white sugarpaste to create a padded headrest.

Step 5

Add your model people and own personal details - mine were based on photos sent by the birthday boy's wife - she was specific about capturing his bald head and beer in his hand!