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After I had searched, sorted and compared recipes, it occurred to me suddenly that my exchange partner has a hazelnut-incompatibility and thus both ideas were out! So I came up with homemade Raider or Twix - no hazelnuts and actually a special childhood memory for me, since I still remember the "Raider is now called Twix" - advertising in 1991 very well! So I baked a shortcrust base for my 22 x 22 cm brownie mold, the one I always use for the cashew toffees.
I was able to use the crème caramel (dulce di leche) from the Russian store which I wanted to use for the Toffifee for the Twix instead, but it was a bit softer than the original caramel.