Final answer:
The law banning the slaughter and canning of horse meat is ironic because horse meat is consumed throughout Europe and processed separately from other meats at specialized butcher shops.
Step-by-step explanation:
The ironic aspect of the law banning the slaughter and canning of horse meat is that horse meat is consumed throughout Europe and is processed separately from other meats at specialized butcher shops. While the United States has outlawed horse meat primarily due to toxins in the meat, Europe has a cultural acceptance and specialized infrastructure for handling horse meat.
This contrast in societal norms and practices related to horse meat consumption highlights the cultural differences and variations in food preferences between different regions.