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How to Make an Underwater Mermaid Cake | Cupcake Jemma

Unicorns? Pah! Old news (I mean, obviously there’s a time and a place but still…). Mermaids are what it’s all about these days. You’ve probably been wondering how you can make the BEST mermaid cake around? Well, so have I. And I think I’ve cracked it. So let me show you how to make it step by step!

You will need…

A cake of your choice, filled and crumb coated
Buttercream or Swiss meringue buttercream coloured with food colour of your choice
Sugarpaste + gum tragacanth or CMC OR ready made modelling paste in a variety of colours
Lustre dusts + clear alcohol
Rubbery silicone mermaid tail and shell moulds for fondant/sugarpaste
Digestive biscuit crumbs
Various (optional) utensils including palette knives, cake smoother, turntable, non-stick board and rolling pin, various brushes, pokey things, toothpicks and probably some other stuff that I forgot!

Some useful videos to watch…
How to do a Perfect Crumb Coat:
How to Make a Rainbow Cake:
How to Make Perfect Swiss Meringue Buttercream:
Buttercream Masterclass:
How to Make Circus Meringue/Unicorn Poops:



MY INSTAGRAM: @cupcakejemma
CAKESTAGRAM: @crumbsanddoilies


Crumbs & Doilies
1 Kingly Court



  1. Rina Manda says:

    I would looooooove you to make a "le petit prince" cake. would like to make it for my sons first birthday. 😊❀

  2. Marie-Anne Durham says:

    Such a fun cake, thank you for new exciting ideas and cake inspiration!🍰🐬🌟

  3. Evie Hallitt says:

    Jemma this is beautiful!

  4. Snow Leopard says:

    That looks so amazing, Jemma!!! I’m in love πŸ₯° with it too

  5. Gloria Yoon says:

    Can your make a masterclass on vanilla cake?

  6. Tanya Castro says:

    Is there a video for the Neapolitan cake? If not, do you have a recipe for strawberry cake?

  7. Donna Cooper says:

    Jemma… aka BOMB.COM❀️❀️❀️❀️❀️

  8. Veron Nunez says:

    Uh-may-zihng marMAYed!

  9. Sheila Mertens says:

    I like your video. I was wondering where do you get your nonstick board from? I have not found one yet.

  10. Aroha Ngaau says:

    Love it

  11. Jitendriya Yalgi says:

    awesome cake but can we put luster dust and all??? 😐

  12. melissa hammac says:

    Firstly I'm all about mermaids, so I love this cake!! but, I keep having a hard time making my buttercream firm. any tips?

  13. The Scran Line says:

    That looks incredible Jemma!

  14. elysiumMB says:

    Who the heck would dislike this vid, or her skills or Her! Am in love with all of it! I will try to attempt it for my daughter’s birthday (as Jemma makes you believe one can do it too). Jemma, how long does it alllllll take. From start to finish. Plz? X

  15. per sebra says:

    the cake is very beautiful but that tail could be a fish, just saying. I would want to show a little more mermaid.

  16. Renee Buddle says:

    So cool! My daughter would love this cake!

  17. tyrell Demar says:

    It looks beautiful but can you make one for just girls

  18. Stephanie BW says:

    Omg I also am in love with this cake!!!! I’m going to try this next month but with a baby shark instead of mermaid since it’s for my baby boy’s first birthday! LOVE πŸ§œπŸΌβ€β™€οΈπŸ§œπŸΌβ€β™€οΈπŸ§œπŸΌβ€β™€οΈπŸ§œπŸΌβ€β™€οΈπŸ§œπŸΌβ€β™€οΈ

  19. Stephanie Eddy says:

    Help Jemma! I've been asked to make a cake for a friend which will be on a long car journey in August. I originally wanted to decorate with buttercream but will it withstand the journey?

  20. Jo Lo says:

    Beautiful cake Jemma!

  21. Hana vlogs says:

    It looks amazing!

  22. Rachida BZG says:

    so beautiful 😍

  23. Lauren Indrisie says:

    Woohoo! Just made this for my sons 4th birthday! See it on Instagram @laurenindrisie πŸ™‚

  24. Sandra Jones says:

    Love this cake

  25. M Rosado says:

    Thank you for this great video…the cake looks awesome!!

  26. Sierra Clark says:

    Whhhhhaaaatt did you say at 13:16 πŸ˜‚πŸ˜‚πŸ˜‚

  27. Michal Klachkin says:

    ahhh!!! screaming using my inner voice lol!!!
    is there a way for me to use fondant instead of gum paste??

  28. Erika says:

    That is such a pretty cake! πŸ™‚

  29. nicoleta dragan says:

    πŸ₯°preciosa πŸ₯°

  30. Naila Mzik says:


  31. Amy Paige says:

    Just curious if Narwhals are a big thin there? My niece has SO many plush toys! Have you done a Narwhal cake?

  32. Carmel Mahon says:

    Fabulous cake Jemma, is there are chance that the fondant decorations would soften if left in contact with the buttercream. ?

  33. Joann Jacquin says:

    What fun!! I love it!!

  34. Chryssi Islander says:

    WoW 🀩

  35. Leanah Webber says:

    How much ingredence did you use for the buttercream frosting please??

  36. Kafia Memon says:

    It’s boy birthday cake or girl?

  37. B l u e B e r r y's says:


  38. London Mermaid says:

    This mermaid approves! It's gorgeous! Xxx

  39. Robin Cole says:


  40. Robin Cole says:


  41. Erin Browne says:

    I’m speechless

  42. Laura Langley says:

    This turned out so pretty . Did you use pearl sugar for bubbles? I was wondering if you used solid sugar to decorate around the mermaid tail. It is a beautiful cake and I love it. Thanks for sharing this wonderful cake.

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