My Grandmother made something she called Dutch cakes..
the cake was dark and contained dates. cut into 4 inch squares finished with a meringue type frosting/icing they were made early and packed away in a big tin until Christmas. The meringue crumble all over you face on first bite.. does any one know what I'm talking about .. looking for a recipe
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https://marilyndishes.com/2017/05/18/meringue-cake-with-dates-nuts-chocolate/
Or this - it seems to be a British / Australian thing:
https://www.taste.com.au/recipes/chocolate-date-meringue-torte/27fc6322-6771-4f27-b405-33068f748aab?nk=54e98977a15950bd30e31179d2dd4a84-1639774884
I did see a recipe for Amish funny cake but it does not sound like your gran's cake (no meringue). Perhaps your gran was a creative baker who developed this herself :)