Butter an 8-inch
(20-cm) square baking pan. Melt the butter with
the sugar, honey, peanut butter, and grated
chocolate in a large saucepan over low heat until
the sugar has dissolved completely.
Remove from the
heat and mix in the orange zest and rice krispies
until well coated.
Press the mixture lightly into
the prepared pan. Let set for 30 minutes before
cutting into squares.