• Preheat oven to 120 degrees celsius / 250 degrees fahrenheit.
• Line 3 baking trays (or round bottoms from a round springform pan or round pizza trays) with baking paper.
• Beat egg whites and salt on medium-high speed until the mixture forms soft peaks.
• Add sugar gradually while mixing on low speed. Then return to med-high speed and beat for another two minutes. The mixture should look thick and glossy and there should be no granules when you rub the mixture between two fingers - if not, continue beating for another minute.
• Return mixture to low speed and add vanilla extract and vinegar. Mix until combined.
• Divide mixture into three equal portions in separate bowls. Stir cocoa powder into one portion and the pink colouring and strawberry flavouring into another.
• Pour each portion onto a lined tray, creating a circle about 17cm in diameter. Using a spatula of flat knife, even out the top and brush up the sides of the circle towards. This will give the shape a slightly domed effect and help with the stability or your pavlova. Make sure the top of the pavlova is flat.
• Place the pavlovas in the pre-heated oven and cook for 60 minutes.
• Turn oven off after cooking time elapses but DO NOT open the oven door. Leave the pavlova to cool in the oven for at least 4 hours, preferably overnight.
• Once completely cool, remove from the oven and carefully remove the baking paper from the bottom of each pavlova.

Decorating

• Divide the cream into 3 separate bowls, with 200ml in each bowl. Place the cocoa powder in one bowl, the icing sugar in another and the pink food colouring in another.
• Beat cream and the other ingredients in each bowl until soft peaks form. Don't overbeat to form stiff peaks as you will risk crushing the pavlova as you decorate it.
• Place chocolate pavlova shell on the serving plate. Spread the cocoa and cream mixture on top. Carefully place plain pavlova shell on top of chocolate cream. Spread icing sugar cream mixture on top. Carefully place pink pavlova shell on top of plain cream. Spread pink cream on top and decorate with strawberries.