I give you the exact recipe that I took sure the mercotte site, BUT, I also give you my impressions .... I took a mold flexipan biscuit roll, the big, because 20/30 it seemed to me really small compared to the amount of Russian background ......
Ingredient: 135g homemade praline, 95g butter at room temperature, 60gsugar, 20g egg whites .make an Italian meringue with sugar and egg whites. (Melt whites and heat sugar to 121 *, combine 2 by beating), put the butter ......