Rhubarb Cake

A fresh Spring/Summer entremet perfect for beginners, featuring a moist white chocolate blondie base with rhubarb, a rich rhubarb ganache, and a light rhubarb mousse.

Yields: 8–10 Servings

Target Mold Size: 18 cm diameter silicone mold (e.g., Silikomart TOR mold)

DAY ONE: Component Preparation & Internal Insert

1) Blondie with Rhubarb (Base Layer)

IngredientsWeight (g)Notes
Caster Sugar60 g 
Butter65 gMelted
White Chocolate (30-35% cocoa solids)65 gMelted
All-Purpose Flour45 g 
Egg (Whole)50 gApproximately 1 egg
White Chocolate (chopped)35 gRoughly chopped
Almonds (chopped)35 gRoughly chopped
Rhubarb (fresh/frozen)35 gChopped
SaltPinch 

Method

  1. Melt Bases: Melt the 65 g of butter and 65 g of white chocolate separately, and set aside.
  2. Combine Wet: Whisk sugar, flour, egg, and salt in a bowl to a light and airy consistency.
  3. Mix: Mix in the melted butter and melted chocolate.
  4. Add Inserts: Add the 35 g chopped white chocolate, 35 g chopped almonds, and 35 g chopped rhubarb.
  5. Bake: Pour the dough into a 16 cm diameter pastry ring/springform pan. Bake the cake for approx. 16–20 minutes at 180°C until set and golden.
  6. Chill Base: Place the cooled cake in a clean 16 cm pastry ring lined with an acetate collar and parchment paper at the bottom. Put in the freezer.

2) Rhubarb Ganache (Insert Layer)

IngredientsWeight (g)Notes
White Chocolate (30-35% cocoa solids)170 gMelted
Rhubarb Purée55 gFrom approx. 150 g rhubarb
Heavy Cream (35% fat)30.9 gApproximately 30 ml

Method

  1. Prepare Purée: Cook the rhubarb until tender and strain to get 55 g of smooth rhubarb purée.
  2. Melt Chocolate: Melt the 170 g of white chocolate and pour it in a bowl.
  3. Heat Cream: Heat the rhubarb purée and heavy cream almost to the boiling point.
  4. Emulsify: Pour the mixture over the chocolate while stirring in the middle with a rubber spatula until the ganache becomes glossy.
  5. Blend and Layer: Hand blend the ganache. Spread the ganache on top of the cake.
  6. Freeze: Freeze the cake overnight until fully set.

DAY TWO: Mousse & Entremet Construction

3) Rhubarb Mousse

IngredientsWeight (g)Notes
Gelatin Sheets (240 Bloom)5.25 g3 sheets, bloomed
Rhubarb (fresh or frozen)260 g 
Caster Sugar120 g 
Vanilla Paste5 gApproximately 1 tsp
Lemon Juice (freshly strained)20.9 gApproximately 2 tbsp
Heavy Cream (35% fat)309 gApproximately 300 ml, chilled

Method

  1. Soften Gelatin: Soak gelatin in cold water.
  2. Cook Purée: Cook rhubarb, sugar, vanilla paste, and lemon juice in a pot until the rhubarb is fully cooked and tender.
  3. Strain and Add Gelatin: Take the pot off the heat, strain the mixture, and whisk the soaked gelatin into the purée.
  4. Cool: Let the purée cool to room temperature/lukewarm ($\approx 28^\circ\text{C}$).
  5. Whip and Fold: Whip the 309 g of heavy cream to soft peaks. Fold into the lukewarm purée.
  6. Pour and Insert: Pour the mousse into an 18 cm silicone mold (e.g., Silikomart TOR mold). Take the frozen 16 cm insert (cake/ganache) out of the freezer and gently press it into the rhubarb mousse with the ganache layer facing downwards.
  7. Freeze: Put the cake in the freezer overnight.

DAY THREE: Finishing & Decoration

4) Decoration

MaterialsWeight (g)Notes
White Chocolate160 gTempered
Food Colouring PowderPink/Peach
FlowersFor final garnish
Glucose SyrupSmall amountFor gluing decoration

Method

  1. Thaw: Remove the cake from the mold and let it thaw in the fridge for 3–6 hours.
  2. Chocolate Ribbons & Rings: Temper the white chocolate and color it with pink/peach food colouring powder. Create ribbons and rings in various sizes.
  3. Assembly:
    • Place the chocolate ribbon around the cake.
    • Place 3 chocolate rings on top of the cake.
    • Decorate with different flowers fastened with a little glucose syrup.
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