The East Lansing store’s best seller is the peanut butter suet cake, which has only three ingredients: rendered beef fat, chopped peanuts and peanut butter. This is my favorite suet cake too (for my birds, I mean). I don't usually have any squirrels on this suet but if I did I would switch it up a little.
Birds will eat the hottest of hot chili peppers happily, a fact so well known that some varieties are popularly known as "bird peppers." When small birds consume the fruits of wild peppers, the seeds pass through the gut undigested and, due to the birds' flight range, are deposited in distant places where they can grow with less competition. If the fruits were consumed by larger mammals the seeds would either be digested, or deposited much closer to the parent plant. Studies have shown that the seeds of wild peppers are in fact dispersed almost exclusively by birds.