It is easy recipe of roll cake, and it takes not too much time. For me, it took 30 minutes and baking time was 10-12 minutes. Okay, you need glass about 250 ml.
1/4 glass of milk
100 grams of flour
40 grams of potato starch
1 tsp.of baking powder (or 1 tsp baking soda)
2/3 glass of sugar
1/4 tsp. salt
Filling: any kind of jam (I used Lingonberry jam of IKEA), whipped cream (200 ml cream half cup powdered sugar), chopped walnuts.
Preheat oven to 190 C°. Cover the pan with parchment sheet. In saucepan, heat milk with butter almost to a boil. Beat eggs and sugar with a mixer to increase the weight of three times (it should have the consistency of thick cream). Beat about 10 minutes. Sift flour with baking powder, starch and salt. Pour flour mixture into the beaten egg, stirring gently from the bottom up a shovel. Add a few spoonfuls of dough in the warm milk and butter and mix well. Pour the mixture into the basic dough, mix well.
The finished cake will have a golden surface, cake can be folded or roll immediately after cooling.
Prepare whipped cream with powdered sugar.
Melt a little bit of jam, lubricate.
Put the cream on the top and roll it.
I sprinkled the cake with chopped walnuts.