What about a slab of vegemite ? ( that's 2 dozen jars ).
Blended with chickory and St. John's Bay Rum it would make a great marinade for the possum. St. John's Bay Rum is / was an after-shave lotion that, in the absence of real booze, sufficed. We had a few bursts of it at Chepachet RI back in 66.
For afters try a vegemite & mayonnaise sandwich. It looks horrible with all the white and black goo in swirls but it tastes yummo!

JG / FME.