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Place a microwave-safe mug on your scales
Measure the butter into the mug and melt in the microwave for 30 seconds
Weigh in the sugar, flour and cocoa powder and add the salt
Mix together, then add the boiling water and mix again until you have a smooth batter
Smooth out the batter until flat
Sprinkle the sugar and cocoa powder in an even layer over the cake mix
Gently pour over the boiling water, trying to cover the sugar and cocoa without mixing the water into the cake batter
Swirl the mug to distribute the water more evenly
Microwave on low for 1-5 minutes, depending on the power of your microwave
Serve with a big scoop of vanilla ice cream when the sponge has risen slightly and is firm to the touch with fudgy, saucy edges