Berry marshmallow slice

Sponge cake

• butter, for greasing
• 60 g caster sugar
• ¼ tsp bicarbonate of soda
• ½ tsp cream of tartar
• 40 g cornflour
• 20 g plain flour
• 2 eggs, room temperature and separated
• ½ tsp natural vanilla extract
• 1 tbsp water, hot

Berry coulis

• 300 g frozen raspberries
• 120 g caster sugar
• 30 g lemon juice

Berry cream

• 8 titanium strength gelatine leaves
• water, cold, for soaking
• 600 g pouring (whipping) cream
• 300 g strawberries, hulled and cut into halves lengthways