Spray a brownie pan with cooking spray

Place the gelatine and 125mls water into a bowl and set aside to bloom

Put the sugar, syrup and 15mls water into a heavy bottomed saucepan

Place on a medium temperature on the stove, stirring frequently with a wooden spoon until the sugar dissolves

Place a sugar thermometer into the bubbling syrup and leave to come up to 115° Celsius

Remove from the heat and add the gelatine

Place the egg whites into a stand mixer bowl and use the whisk attachment to beat them until stiff peaks form

Add the syrup and the rose water and continue whipping for 10 minutes

Scrape the mixture using a silicone spatula into your prepared pan and spread evenly

Spray a piece of baking paper to fit over the pan with cooking spray

Place on top of the marshmallows, sprayed side down and set aside to set for at least 8 hours

Tip out, keeping the baking paper in place to use as a cutting surface

Spray a sharp knife with cooking spray and cut desired size marshmallows

Dust each one in the chocolate drinking powder and store in an airtight container