Strawberry mousse cake

Ingredients

• 340 gram packet buttercake mix
• 2 eggs
• 60 gram butter, at room temperature
• 3/4 cup milk
• 500 gram strawberries
• 1/4 cup icing sugar
• 2 teaspoon powdered gelatine
• 375 gram packet jam sponge roll
• 300 millilitre cream, whipped