Drain the plums and collect the juice. Mix starch and 3 tablespoons of juice. Fill up the rest of the juice with water to 1/4 l liquid. Bring to the boil with 2 tbsp. sugar. Stir in starch and simmer for about 1 minute. Fold in plums. Let cool slightly in a greased casserole dish (approx. 1 l capacity)
Heat 1/8 l milk. Soak rusk in it. Place on the compote
Take 6 tbsp. of 1/2 l milk, stir with pudding powder and 3 tbsp. sugar until smooth. Boil up the remaining milk. Stir in pudding powder and simmer for about 1 minute. Spread on the rusk
Beat the egg white until stiff, adding 3 tbsp. sugar and lemon juice. Spread on the pudding. Bake the casserole on the lower shelf in a preheated oven (electric range: 175 °C/circulating air: 150 °C/ gas: level 1-2) for 10-15 minutes