Lightbulb with mustard

What does a marten eat? If it is not obvious (to the kids who get the magazine) after reading the editorial text, they will find in my drawing that only one (food)item is for the liking of the marten. Never mind the fact that a lightbulb with mustard sounds delicious.
If I was Marten, I would walk beside the given paths and at least take the lightbulb as well and go home after a delicious meal, screw the bulb into my bedsidelamp and read a book till my eyelids feel heavy and I slide into the nightly adventures.