Amazingly tender Roll for Tea

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For biscuit
Eggs - 5 pcs.
Sugar - 5 tbsp (100g)
Flour - 5 tbsp (100 g)
Cocoa - 2 tbsp (20 g)
Milk - 1 tbsp
Vanillin - 1 tsp
Salt - a pinch

For cream
Milk - 250 ml
Butter - 150 g
Sugar - 4 tbsp (80 g)
Cornstarch - 1.5 tbsp (20g)
Vanillin - 0.5 tsp