When Hannah Spiegelman makes ice cream and other frozen desserts, her flavors are as elaborate and fanciful as anything you’d find in an artisanal shop. She’s created treats as varied as lavender gin-infused ice cream with lemon and marshmallow-root meringues to sweet-tart raspberry mint shrub sherbet, with gingerbread cookie shards and orange butterscotch sauce swirling throughout. However, these flavors serve a bigger purpose than simply experimenting with novelty. On her website and Instagram, both titled A Sweet History, Spiegelman uses ice cream to highlight historical events, people, and places. So…