Wash plums, dab dry, cut in half and remove stones. Boil up the plums, 1/4 litre water, 60 g sugar and cinnamon stick. Simmer for 3-5 minutes. Mix sauce powder with a little cold water until smooth and stir into the boiling liquid.
Cook for 1 minute while stirring. Remove the cinnamon stick. Pour the compote into 4 ovenproof moulds. Beat the egg white with salt and lemon juice until stiff. Gradually pour in 100 g sugar. Stir until the sugar has dissolved and the mixture is shiny.
Pour into the middle of the moulds and spread in waves. Sprinkle with flaked almonds. Bake in a preheated oven (electric range: 225 °C/ convection oven: 200 °C/ gas: 4) for 5-8 minutes until golden brown. Let cool down a little.
Serve still warm decorated with mint.